I deleted my GitHub account on 28-Nov-2019. It's a great platform for opensource project, but mine are not collaborative, it's just me + translators. We don't need bugtrackers, etc...
Also, like any other social network, it became distractive (to my taste).
For RE4B source code, see: https://beginners.re/src/.
For SSBE git repo: git clone http://hackspace.odessa.ua/git/SSBE/
Please drop me email about any bug(s) and suggestion(s): dennis(@)yurichev.com.