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emailThe Open Source & Self Hostable RMM.
NetLock RMM is a full-featured Open-Source RMM for self-hosting or managed in the NetLock Cloud. With support for multiple clients, multiple languages and even more powerful features such as a antivirus management system.
NetLock RMM is an Remote Monitoring & Management (RMM) software built for Managed Service Providers, with a future focus on cybersecurity. NetLock RMM is primarily written in C#, Blazor, ASP.NET Core, and SignalR.
NetLock RMM can be deployed in various environments, including cloud setups or isolated/offline configurations. It supports multiple operating systems, including Windows and Linux, and can also run within Docker & Kubernetes, providing flexibility for different deployment preferences.
SmokePing is a deluxe latency measurement tool. It can measure, store and display latency, latency distribution and packet loss. SmokePing uses RRDtool to maintain a longterm data-store and to draw pretty graphs, giving up to the minute information on the state of each network connection.
Conky is a free, light-weight system monitor for X, that displays any kind of information on your desktop. It can also run on Wayland (with caveats), macOS, output to your console, a file, or even HTTP (oh my!).
One-click lightweight server monitor tool based on ZeroMQ protocol. Works on Windows, Linux, macOS, Raspberry PI (x32, x64, arm, arm64). Inspired by nezhahq/nezha, zabbix, prometheus. Takes no more than 15MB to run.
An open source server monitoring application.
Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations.
pg_activity is a top like application for PostgreSQL server activity
monitoring.
Status Page On Demand. 
Automated developer-oriented status page.
The automated status page that you deserve.
If your infrastructure went down right now, how long would it take for you to know?
Gatus is a developer-oriented health dashboard that gives you the ability to monitor your services using HTTP, ICMP, TCP, and even DNS queries as well as evaluate the result of said queries by using a list of conditions on values like the status code, the response time, the certificate expiration, the body and many others. The icing on top is that each of these health checks can be paired with alerting via Slack, Teams, PagerDuty, Discord, Twilio and many more.
An 'Observe and Report Buddy' for your SRE toolbox.
Green Orb is a lightweight monitoring tool that enhances your application's reliability by observing its console output for specific patterns and executing predefined actions in response. Designed to integrate seamlessly, it's deployed as a single executable binary that runs your application as a subprocess, where it can monitor all console output, making it particularly useful in containerized environments. Green Orb acts as a proactive assistant, handling essential monitoring tasks and enabling SREs to automate responses to critical system events effectively.
Network Analysis & Packet Capture. It's amazing what you discover when you start looking.
Arkime is an open source, large scale, full packet capturing, indexing, and database system.
comfortably monitor your Internet traffic 
♂️.
"If you're looking for a quick and easy way to monitor your network traffic, this cross-platform app written in Rust definitely passes the Sniff Test"
Sniffnet is a network monitoring tool to help you easily keep track of your Internet traffic.
Whether you want to gather statistics, or you need to inspect more in depth what's going on in your network, this app will get you covered.
Monitor changes in Active Directory with replication metadata.
Tool for monitor Active Directory changes in real time without getting all objects. Instead of this it use replication metadata and Update Sequence Number (USN) to filter current properties of objects.
ADSpider - Monitor changes in Active Directory with replication metadata @ Laurent M.'s LinkedIn 
A Tiny Dashboard for Network UPS Tools
WUD (aka What's up Docker?) gets you notified when a new version of your Docker Container is available.
Gets you notified when new versions of your Docker containers are available and lets you react the way you want.
Postgres performance at any scale. PostgreSQL Tuning
Deliver consistent database performance and availability through intelligent tuning advisors and continuous database profiling.
An open source, real-time monitoring tool with custom-monitor and agentLess.
Apache HertzBeat is a real-time monitoring system with agentless, performance cluster, prometheus-compatible, custom monitoring and status page building capabilities.
Records an executable's network activity into a Full Packet Capture file (.pcap) and much more.
Monitors network activity made by a process through the use of Windows Event Tracing (ETW) and Full Packet Capture (FPC). Filters a generated .pcap file with BPF based on the detected network activity made by the process. This application makes process network monitoring hella' easy.
APM for Ruby, Elixir, Node.js & Python. No-brainer monitoring for smart developers.
Application Monitoring for Ruby on Rails, Elixir, Node.js & Python.
Tianji: Insight into everything, Website Analytics + Uptime Monitor + Server Status. not only another GA alternatives.
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WIFI / LAN intruder detector. Scans for devices connected to your network and alerts you if new and unknown devices are found.
Get visibility of what's going on on your WIFI/LAN network. Schedule scans for devices, port changes and get alerts if unknown devices or changes are found. Write your own Plugins with auto-generated UI and in-build notification system. Build out and easily maintain your network source of truth (NSoT).
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All-in-One Technical Website Monitoring.
Ensure that every aspect of your website is in top condition. Get notified when something is off.