Spaced-repetition app, the best for scientists and coders. With rich formatting, with images, with code formatting, with formulas, with multiple flashcard types. Entirely free, open-source.




Spaced-repetition app, the best for scientists and coders. With rich formatting, with images, with code formatting, with formulas, with multiple flashcard types. Entirely free, open-source.




OpenSearch is a community-driven, open source search and analytics suite derived from Apache 2.0 licensed Elasticsearch 7.10.2 & Kibana 7.10.2. It consists of a search engine daemon, and a visualization and user interface, OpenSearch Dashboards.

Volumio is a free and Open Source Linux Distribution, designed and fine-tuned exclusively for music playback. It runs on a variety of devices, typically small and cheap computers like the Raspberry PI, but also on low power PCs, notebooks or thin clients.




OpenWISP is a free and open-source platform for efficient IT network deployment, monitoring & management. It allows automation of many aspects of networks: from configuration to monitoring, RADIUS, hotspots, mesh and firmware upgrades, all backed by the reliability of the...




Alternative YouTube frontend offering ad-free viewing, private search and discovery, channel subscriptions, playlist support, and push notifications on all devices.



Koding is a self-hosted development environment for teams to come together and code in the browser. Developers can work, collaborate, write and run apps without jumping through hoops and spending unnecessary money.



PlayCanvas is the world’s easiest to use WebGL Game Engine. It’s free, it’s open source and it’s backed by amazing developer tools.




htmx gives you access to AJAX, CSS Transitions, WebSockets and Server Sent Events directly in HTML, using attributes, so you can build modern user interfaces with the simplicity and power of hypertext



opensource-socialnetwork also know as OSSN is a social networking software written in PHP. It allows you to make a social networking website, helps your members build social relationships with people who share similar professional or personal interests.




Zammad is a web based open source helpdesk/customer support system with many features to manage customer communication via several channels like telephone, Facebook, Twitter, chat and e-mails.




A lightweight comments widget built on GitHub issues. Use GitHub issues for blog comments, wiki pages and more!








NocoBase is a scalability-first, open-source no-code development platform. No programming required, build your own collaboration platform, management system with NocoBase in hours.




Engage customers with precision by targeting segmented audiences, crafting personalized messages, and optimizing marketing funnels using intuitive tools.




Unison is a statically-typed functional language with type inference, an effect system, and advanced tooling. It is based around a big idea of content-addressed code, in which function are identified by a hash of their implementation rather than by name, and code is stored as...

Fully open source instant messaging server and clients. No proprietary components or non-free dependencies. Backend in pure Go (GPL 3.0), with a command-line administration tool in python + gRPC. Clients for Android, iPhone, and Web - ReactJS (all licensed under Apache 2.0).




Take control of your digital library. BookHeaven is a tiny self-hosted ecosystem that helps you manage and read your e-books in a very convenient way.


Secure, end-to-end encrypted, and privacy respecting sync for your contacts, calendars and tasks. Everything is encrypted on the client-side and all the code (client and server) is open source.




Fast and powerful management tool for SVN, Mercurial, and GIT with a built in push/pull server and full text search and code-review. It works on http/https and has a built in permission/authentication system with the ability to authenticate via LDAP or ActiveDirectory.



The Placemark application. This is a web application that lets you import, create, export, visualize, and publish geospatial data. It supports many geospatial data formats, and many editing operations, both algorithmic, like buffering, and drawing-based.

Prying Deep crawls dark/clear net platforms and extracts as much intelligence as possible effectively.


