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A simple, fast and user-friendly alternative to 'find' .
fd is a program to find entries in your filesystem. It is a simple, fast and user-friendly alternative to find. While it does not aim to support all of find's powerful functionality, it provides sensible (opinionated) defaults for a majority of use cases.
Open Source File Sync&Share and Document Collaboration Platform
Seafile is an open source file sync and share platform, focusing on reliability and performance. Seafile's built-in collaborative document SeaDoc, make it easy for collaborative writing and publishing documents.
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Unison is a file-synchronization tool for POSIX-compliant systems (e.g. *BSD, GNU/Linux, macOS) and Windows. It allows two replicas of a collection of files and directories to be stored on different hosts (or different disks on the same host), modified separately, and then brought up to date by propagating the changes in each replica to the other.
Let File Juggler organize your files.
File Juggler makes it easy to create automatic workflows with files.
Tames problematic filenames.
detox is a program that renames files to make them easier to work with under Linux and other Unix-like operating systems. Spaces and various other unsafe characters (such as "$") get replaced with "_". The upper portion of ISO-8859-1 (Latin-1) can be transcoded to UTF-8, as can CP-1252.
Extremely fast tool to remove duplicates and other lint from your filesystem.
rmlint finds space waste and other broken things on your filesystem and offers to remove it.
The VichUploaderBundle is a Symfony bundle that attempts to ease file uploads that are attached to ORM entities, MongoDB ODM documents, or PHPCR ODM documents.
Sleek, modular open source JavaScript file uploader
Uppy is a sleek, modular JavaScript file uploader that integrates seamlessly with any application. It’s fast, has a comprehensible API and lets you worry about more important problems than building a file uploader.
Uppy fetches files locally and from remote places like Dropbox or Instagram. With its seamless integration, reliability and ease of use, Uppy is truly your best friend in file uploading.
A file manager from the future. One Explorer. All Your Files.
Unify files from all your devices and clouds into a single, easy-to-use explorer.
Designed for creators, hoarders and the painfully disorganized.
Spacedrive is an open source cross-platform file explorer, powered by a virtual distributed filesystem written in Rust.
Interactively find and recover deleted or 
overwritten 
files from your terminal.
USB virus cleaning station.
Retrieve untrusted files from USB (via keysas-io) or over the network.
Temporary File Upload.
All uploaded files are automatically deleted after 60 minutes.
Minimalist Drag & drop file sharing app
Open Source Continuous File Synchronization.
Syncthing is a continuous file synchronization program. It synchronizes files between two or more computers in real time, safely protected from prying eyes. Your data is your data alone and you deserve to choose where it is stored, whether it is shared with some third party, and how it’s transmitted over the internet.
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Lufi means Let's Upload that FIle.
Hosty is a tiny PHP application to host images (and text, if you want to) on your own webserver. It's meant to be as small as possible and hence offers only the following:
Users configured in the config file can upload images. Optionally, they can also paste code (à la pastebin) with simple syntax highlighting.
Each image/paste gets a randomized URL. Everyone who has the URL can access the content.
Content can be deleted by logged-in users.That's it. There is no admin UI, no commenting, no tagging, no folders, no social media crap or other external resources.
Rakoshare is a sharing tool to synchronize a folder on multiple computers with no configuration.
It was inspired by Bittorrent Sync and aims to be an Open Source alternative. Internally it reuses the Bittorrent protocol to build a more dynamic protocol.
TagSpaces is an open source personal data manager.
It helps you organize files with tags on every platform.
Open source PHP/Ajax cloudware that puts FTP file management right in your browser, anywhere, any time.
Open Source PHP/Ajax Drag & Drop FTP Manager
File Thingie is a small web-based file manager written in PHP. It is intended for those who need to give others access to a part of their server's file system when FTP is not practical. Through File Thingie you and your users get access to the most common functions: