OnlyOffice

OnlyOffice (formerly TeamLab), stylized as ONLYOFFICE, is an open source office suite developed by Ascensio System SIA, a company with headquarters in Riga, Latvia. Solution features online document e...
Language(s): HTML, JavaScript, C++
Operating system(s): Windows, Mac OS, Linux, Android, iOS
License: AGPLv3

OpenCV

OpenCV (Open Source Computer Vision Library) is released under a BSD license and hence it’s free for both academic and commercial use. It has C++, Python and Java interfaces and supports Windows, Linu...
Language(s): C, C++, Python, Java
Operating system(s): Windows, Linux, Mac OS, iOS, Android
License: BSD license

OpenVPN

OpenVPN provides flexible VPN solutions to secure your data communications, whether it's for Internet privacy, remote access for employees, securing IoT, or for networking Cloud data centers. Our VPN ...
Language(s): C
Operating system(s): Windows XP or later, Mac OS X 10.8 or later, Android 4.0 or later, iOS 6 or later, Linux, BSD
License: GNU General Public License

SageMath

SageMath is a free open-source mathematics software system licensed under the GPL. It builds on top of many existing open-source packages: NumPy, SciPy, matplotlib, Sympy, Maxima, GAP, FLINT, R and ma...
Language(s): Python
Operating system(s): Linux, Mac OS, Windows, Solaris, Android, iOS
License: GPLv3

Signal

Signal is a cross-platform encrypted messaging service developed by the Signal Foundation and Signal Messenger LLC. It uses the Internet to send one-to-one and group messages, which can include files,...
Language(s): N/A
Operating system(s): Android 4.4 or later, iOS 9.0 or later, Windows 7 or later (64-bit), Mac OS 10.9 or later,] Linux distributions
License: Clients: GPLv3, Server: AGPLv3