Open Source Education Software
SpeedCrunch
SpeedCrunch is a free and open-source high-precision scientific calculator. The application features a fast, keyboard-driven user interface that displays results as you type. SpeedCrunch comes with over 80 built-in mathematical functions, if that's not enough, you can define your own functions. A library of built-in formulas that allows to you to review and insert commonly used formulas is also included. SpeedCrunch can be downloaded for macOS, Linux and Windows, and is licensed under the GNU General Public License.
wikidPad
wikidPad is a Wiki-like note taking application for storing your thoughts, ideas, todo lists, contacts, or anything else you can think of to write down. What makes wikidPad different from other notepad applications is the ease with which you can cross-link your information. Links in a wiki are created by typing in WikiWords. wikidPad allows you to get a better undestanding of your research and documentation and allow you to better explore and rediscover your knowledge.
LibreOffice Impress
LibreOffice Impress is a free and open source presentation and slide show software that allow you to create interactive slide shows for your next presentation.
Slate API Docs Generator
Slate' API Docs Generator helps you create beautiful, intelligent, responsive API documentation.
Gitter
Gitter is an open-source instant messaging and chat room system for developers designed to make community messaging, collaboration and discovery as smooth and simple as possible. Gitter is provided as software-as-a-service and integrates with GitLab and GitHub repositories to make discussion around code even easier. With Gitter, you can can easily create, organise and grow your communities, inviting others to join just in one click. Over 1.5M users across 100K communities use Gitter to discuss code and development progress.
XWiki
Developed for more than 10 years, XWiki is a long standing project trusted by individuals and high profile corporations. XWiki is a free and open source Wiki software written in Java and released under the GNU Lesser General Public License. XWiki provides a WYSIWYG editing, OpenDocument based document import/export, semantic annotations and tagging, and advanced permissions management fit for enterprise use. The extensible XWiki platform allow you to customaize and improve your Wiki as the content, userbase or usecase grows and evolves.
MoinMoin
MoinMoin is a free and open-source, Python-based WikiEngine thate features an extensible core. With MoinMoin you can create self-hosted wikies and informational resource sites. MoinMoin's extensible core allow for plugins to be installed to further extend the capability of the software. Allowing you to install auth plugins for custom authentication, filter plugins for indexing file attachments of different mimetypes, parsers for new input formats formatters to produce different output formats than HTML, themes xmlrpc and CMS solutions.
MediaWiki
MediaWiki is a free and open source wiki engine used by thousands of organizations and websites across the globe. It's the software that powers Wikipedia, which was released as a free and open source project under the name MediaWiki, a year after the release of Wikipedia. The software allows people to collect and organize knowledge in cooperation with one another, and make it available on the web. MediaWiki is now built by a community of open source developers and provides plugins can be used to extend the software further. Allowing sister sites like Wiktionary, Wikimedia Commons and Wikidata to utilize the same code base.
ReadTheDocs
ReadTheDocs is a huge resource that millions of developers rely on for software documentation. With ReadtheDocs it simple to create documentation for your development project that will be hosted free, forever. ReadTheDocs integrates with your favorite version control system, be it Git, Mercurial, Bazaar, or Subversion. Allowing you to push documentation along with project updates through your CI/CD pipeline.