Boson

Home: http://boson.sourceforge.net/index.php, https://sourceforge.net/projects/boson/
State: beta, inactive since 2006
Download: http://boson.sourceforge.net/download.php, https://sourceforge.net/projects/boson/files
Keyword: strategy, real-time
Code repository: https://gitlab.com/osgames/boson.git (backup of svn, @created 2018, @stars 1, @forks 1), https://svn.code.sf.net/p/boson/code (svn)
Code language: C++, C
Code license: GPL-2.0
Code dependency: OpenGL
Developer: Andreas Beckermann, Ben Adler, Felix Seeger, Krzysztof Kosz, Mickael Marchand, Nils Trzebin, Rivo Laks, Scott MacDonald, Thomas Capricelli, Timo Huebel

More like alpha.

Building