Links
AddYour own search engine for documents, images, tables, files, intranet & news. Free Software for your own Search Engine, Data Explorer, Analytics, Text Mining and Research Tools based on Apache Lucene / Solr or Elastic Search open-source enterprise-search and Open Standards for Linked Data and Semantic Web.
Open Source SEO Platform. Open source alternative to Semrush and Ahrefs. Own your SEO. Research keywords and competitors on your terms. 100% open source.
OpenSEO is an SEO tool for the people. If tools like Semrush or Ahrefs are too expensive or bloated, OpenSEO is a pay-as-you-go alternative that you actually control.
OpenSesame is a device that can wirelessly open virtually any fixed-code garage door in seconds, exploiting a new attack I've discovered on wireless fixed-pin devices. Using a child's toy from Mattel.
Your teamās control room for coding agents.
Self-hosted agent-infrastructure server: a web UI plus Slack, Linear, Plain, and GitHub agents, driving coding sessions through the Pi engine in git worktrees on your own box, or in isolated sandboxes. Supports multiple Codex and Claude subscriptions and model APIs.
Develop, Host, and Scale Your Apps in the Cloud The Open Hybrid Cloud Application Platform by Red Hat
Open Source, Self-Hostable Deployment Platform.
Push your code - builds, config, and deployment are handled automatically. Use our cloud or connect your own servers. Zero lockāin, completely openāsource.
Open-source, self-hostable deployment platform with built-in CI/CD. Push code, ship containers, manage infrastructure ā from a desktop app, web dashboard, or CLI.
Free, Open, and Award-Winning Video Editor for Linux, Mac, and Windows! A free, open-source video editor thatās easy to use, quick to learn, and surprisingly powerful.
The Free & OpenSource Alternative to Docusign.
Seal the Deal, Openly. Your ultimate open source PDF E-Signature Solution. Transform the Way You Sign, Store, and Secure Your Documents. All in One Place - All for Free.
Universal skills loader for AI coding agents. One CLI. Every agent. Same format as Claude Code.
OpenSkills brings Anthropic's skills system to every AI coding agent ā Claude Code, Cursor, Windsurf, Aider, Codex, and anything that can read AGENTS.md.
The slide framework built for agents.
A React-first slide framework authored by AI agents. Every page is arbitrary code on a 1920Ć1080 canvasā versioned, reviewable, yours.
OpenSnitch is a GNU/Linux port of the Little Snitch application firewall.
Open Sonic is an open-source game based on the "Sonic the Hedgehog" universe. It introduces a different style of gameplay called cooperative play, in which it's possible to control 3 characters simultaneously. Unlike most similar games, Open Sonic provides a greater level of interaction between the player and the levels. It's more than just a jump'n'run; the user must come up with some strategy in order to get through the levels.
Open source Sonic the Hedgehog for the browser.
Open Sonic is a free open-source game based on the "Sonic the Hedgehog" universe. It introduces a different style of gameplay called cooperative play, in which it's possible to control 3 characters simultaneously. Unlike most similar games, Open Sonic provides a greater level of interaction between the player and the levels. It's more than just a jump'n'run; the user must come up with some strategy in order to get through the levels.
Discover 400+ popular open source alternatives to your proprietary SaaS
The Most Widely Deployed Open Source Cloud Software in the World. Deployed by thousands. Proven production at scale. OpenStack is a set of software components that provide common services for cloud infrastructure.
Simple Color System for Complex Digital Interfaces.
Carefully picked colors to match with your interfaces challenges.
World's First Endowment Fund for OSS. Truly sustainable funding for critical OSS through a communityādriven endowment.
Mozilla Japan furnitures and workspace organisation using recycled and low cost furnitures.
This site tries to gather open-source remakes of great old games in one place. If you think that something is missing from the list - please go to our GitHub repository and create an issue or even a pull request!
Related contents:
This is a list of different open-source video games and commercial video games open-source remakes.
Open source software is made by people just like you. Learn how to launch and grow your project.
The Open Source Insights page for each package shows the full dependency graph and updates it every day. The information provided can help you make informed decisions about using, building, and maintaining your software.
Related contents:
Pay your share.
Whether you're a CEO, CFO, CTO, or just a dev, your company surely depends on Open Source software. It's time to pay the maintainers.
An open source program office (OSPO) serves as the center of competency for an organization's open source operations and structure. It is responsible for defining and implementing strategies and policies to guide these efforts.
SeekQuarry is the parent site for Yioop!. Yioop! is a GPLv3, open source, PHP search engine. Yioop! can be configured as either a general purpose search engine for the whole web or it can be configured to provide search results for a set of urls or domains.
:mortar_board: Path to a free self-taught education in Computer Science!
The OSSU curriculum is a complete education in computer science using online materials. It's not merely for career training or professional development. It's for those who want a proper, well-rounded grounding in concepts fundamental to all computing disciplines, and for those who have the discipline, will, and (most importantly!) good habits to obtain this education largely on their own, but with support from a worldwide community of fellow learners.
š§® Path to a free self-taught education in Mathematics!
The OSSU curriculum is a complete education in mathematics using online materials. It's for those who want a proper grounding in concepts fundamental to all math disciplines, and for those who have the discipline, will, and good habits to obtain this education largely on their own, but with support from a worldwide community of fellow learners.
"Open Source TripwireĀ® software is a security and data integrity tool useful for monitoring and alerting on specific file change(s) on a range of systems. The project is based on code originally contributed by Tripwire, Inc. in 2000."
Let's build a better web together. We give anyone the power to create, share, and use beautiful custom elements made with CSS and HTML.
At its core, localStorage is a simple key-value store which uses strings as keys and can only store strings as values. Even if you try to store a non-string object into localStorage, it will be converted into a string before it is saved. This means that the developer has to worry about coercing the data back into the intended type before it is used in code again. Still, localStorage's ability to save data between sessions and browser restarts without relying on massive cookies makes it an appealing storage mechanism.
Make Your Agents: Smarter, Low-Cost, Self-Evolving" -- Community.
Turn every task, trial, and triumph into shared intelligence with OpenSpace.
One Command to Evolve All Your AI Agents: OpenClaw, nanobot, Claude Code, Codex, Cursor and etc.
A lightweight specādriven framework.
OpenSpec aligns humans and AI coding assistants with spec-driven development so you agree on what to build before any code is written. No API keys required.
Related contents:
Open Spots is a fork of Spots that is designed to help organizations deliver real-time building availability data to staff, employees, customers, or students.
Developers can create an API to deliver their own data to the Open Spots platform. This data can be visualized on an interactive map, and display available spots (rooms with time slots).
Read and write spreadsheet files (CSV, XLSX and ODS), in a fast and scalable way.
OpenSpout is a community driven fork of box/spout, a PHP library to read and write spreadsheet files (CSV, XLSX and ODS), in a fast and scalable way. Unlike other file readers or writers, it is capable of processing very large files, while keeping the memory usage really low (less than 3MB).
Domain Name Threat Intelligence.
The openSquat is a tool for identifying domain look-alikes by searching for newly registered domains that might be impersonating legit domains and brands.
Agentic Alert Investigation for Production Pipelines.
Automated root cause analysis before your team gets paged. Build your own AI SRE agents. The open source toolkit for the AI era āØ
The open-source framework for AI SRE agents, and the training and evaluation environment they need to improve. Connect the 60+ tools you already run, define your own workflows, and investigate incidents on your own infrastructure.
OpenSSF Scorecard assesses open source projects for security risks through a series of automated checksIt was created by OSS developers to help improve the health of critical projects that the community depends on.
You can use it to proactively assess and make informed decisions about accepting security risks within your codebase. You can also use the tool to evaluate other projects and dependencies, and work with maintainers to improve codebases you might want to integrate.
Scorecard is an automated tool that assesses a number of important heuristics ("checks") associated with software security and assigns each check a score of 0-10. You can use these scores to understand specific areas to improve in order to strengthen the security posture of your project. You can also assess the risks that dependencies introduce, and make informed decisions about accepting these risks, evaluating alternative solutions, or working with the maintainers to make improvements.
Related contents:
Build better security habits, one test at a time. Quickly assess open source projects for risky practices.
Related contents:
Fluent OpenStack client for Java.
OpenStack4j is a fluent OpenStack client that allows provisioning and control of an OpenStack deployment. This includes support for Identity, Compute, Image, Network, Block Storage, Telemetry, Data Processing as well as many extensions (LBaaS, FWaaS, Quota-Sets, etc)
Open source software for building private and public clouds.
OpenSuperWhisper is a macOS application that provides real-time audio transcription using the Whisper model. It offers a seamless way to record and transcribe audio with customizable settings and keyboard shortcuts.
Related contents:
CLI Code Agent Orchestrator. Autonomous AI agent orchestrator powered by Claude Code CLI.
OpenSwarm orchestrates multiple Claude Code instances as autonomous agents. It picks up Linear issues, runs Worker/Reviewer pair pipelines to produce code changes, reports progress to Discord, and retains long-term memory via LanceDB vector embeddings.
An Open-Source Asynchronous Coding Agent. Open-source framework for building your org's internal coding agent.
Elite engineering orgs like Stripe, Ramp, and Coinbase are building their own internal coding agents ā Slackbots, CLIs, and web apps that meet engineers where they already work. These agents are connected to internal systems with the right context, permissioning, and safety boundaries to operate with minimal human oversight.
Open SWE is the open-source version of this pattern. Built on LangGraph and Deep Agents, it gives you the same architecture those companies built internally: cloud sandboxes, Slack and Linear invocation, subagent orchestration, and automatic PR creation ā ready to customize for your own codebase and workflows.
Related contents:
An Open-Source Asynchronous Coding Agent.
Open SWE is an open-source cloud-based asynchronous coding agent built with LangGraph. It autonomously understands codebases, plans solutions, and executes code changes across entire repositoriesāfrom initial planning to opening pull requests.
PHP Server with Async IO, Coroutines and Fibers (previously Swoole).
High-quality, ubiquitous, and portable telemetry to enable effective observability.
Related contents:
- Even more OpenTelemetry - Kubernetes special @ A Java geek.
- What is OpenTelemetry? @ SigNoz.
- CI/CD Observability with OpenTelemetry - A Step by Step Guide @ SigNoz.
- OpenTelemetry configuration gotchas @ A Java geek.
- From chaos to clarity: How OpenTelemetry unified observability across clouds @ CNCF.
- How to build a cost-effective observability platform with OpenTelemetry @ CNCF.
- Why the OpenTelemetry Batch Processor is Going Away (Eventually) @ dash0.
- From Signals to Reliability: SLOs, Runbooks and Post-Mortems @ Fatih KoƧ.
- OpenTelemetry Collector vs agent: How to choose the right telemetry approach @ CNCF.
- How to Reduce Telemetry Volume by 40% Smartly (Java) @ Observability Real Talk.
- Why OpenTelemetry Is Paving the Way for the Rise of the Observability Warehouse @ DevOps.
- Open standards in 2026: The backbone of modern observability @ Grafana Labs Blog.
- Telemetry that matters: Designing sustainable, high-impact observability pipelines @ CNCF.
- Don't Wrap OpenTelemetry ā You're Probably Hurting More Than Helping @ OpenTelemetry.
- Operating OpenTelemetry at scale with OpAMP @ CNCF.
- Deploy OpenTelemetry Gateway on AWS: Monitoring Your Observability Pipeline @ AWSāÆCloud Operations Blog.
- One-command OpenTelemetry setup on Linux hosts @ OpenTelemetry.
The OpenTelemetry Collector offers a vendor-agnostic implementation on how to receive, process and export telemetry data. In addition, it removes the need to run, operate and maintain multiple agents/collectors in order to support open-source telemetry data formats (e.g. Jaeger, Prometheus, etc.) to multiple open-source or commercial back-ends.
This repository provides eBPF instrumentation based on the OpenTelemetry standard. It provides a lightweight and efficient way to collect telemetry data using eBPF for user-space applications.
OpenTelemetry e-BPF Instrumentation is commonly referred to as OBI.
Related contents:
This is an OpenTelemetry auto-instrumentation package for Symfony framework applications.
OpenTimestamps aims to be a standard format for blockchain timestamping.
The open source infrastructure as code tool.
Previously named OpenTF, OpenTofu is a fork of Terraform that is open-source, community-driven, and managed by the Linux Foundation.
Related contents:
- OpenTofu becomes the real deal @ InfoWorld.
- Terraform Compact Function: Clean Up & Simplify Lists @ spacelift.
- How We Migrated 30+ Kubernetes Clusters to Terraform @ Learnings from the paas' Medium.
- The Case for Terraform Modules: Scaling Your Infrastructure Organization @ Infisical.
- Best Practices to Promote from DEV to PROD Environments with HashiCorp Terraform using Workspaces and Folders @ Build5Nines.
- How to Structure a Terraform Project @ Spacelift's dev.to.
- Terraform Stacks - Part 1 - An Introduction @ Mike Guy.
- How to use Terraform to generate secrets @ Techielass.
- Building Meaningful Terraform Test Workflows @ Mark Tinderholt's Medium.
- OpenTofu at Scale: 4 Strategies & Scaling Best Practices @ spacelift.
- Upgrading Our Infrastructure with OpenTofu @ spacelift.
- Terraform vs OpenTofu: Which IaC tool fits your platform strategy? @ Platform Engineering.
- How to Migrate From Terraform to OpenTofu @ Spacelift.
A Model Context Protocol (MCP) server for accessing the OpenTofu Registry. This server allows language model assistants to search for and retrieve information about OpenTofu providers, modules, resources, and data sources.
Enjoy Together - Watch videos together online with your friends.
Real-time synchronized playback. Optional voting system. Dark theme. No sign up required. All Open Source. It's never been easier to watch videos together.
Related contents:
opentracker is an open and free bittorrent tracker project. It aims for minimal resource usage and is intended to run at your wlan router.
Related contents:
OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase. OpenTSDB was written to address a common need: store, index and serve metrics collected from computer systems (network gear, operating systems, applications) at a large scale, and make this data easily accessible and graphable.
OpenTUI is a library for building terminal user interfaces (TUIs).
OpenTUI is a TypeScript library for building terminal user interfaces (TUIs). It is currently in development and is not ready for production use. It will be the foundational TUI framework for both opencode and terminaldotshop.
Terminal UIs on a Native Zig Core. OpenTUI is a library for building terminal user interfaces (TUIs).
Build rich, interactive terminal interfaces with TypeScript bindings, first-class React/Solid support, and a C ABI for any language.
Related contents:
Ultra-fast, simple and powerful cross-platform IPTV app.
Related contents:
- Mission: Maintain an open standard for UI and promote its adherence and adoption.
- Audience: The broader UI community including designers, engineers, and managers.
The purpose of Open UI to the web platform is to allow web developers to style and extend built-in web UI controls, such as <select> dropdowns, checkboxes, radio buttons, and date/color pickers. To do that, we'll need to fully specify the component parts, states, and behaviors of the built-in controls, as well as necessary accessibility requirements, and provide test suites to ensure compatibility. We'll also implement polyfills for our extensible web UI controls.