About starting google group I think no, this is more political question, we have our own resources (git, issues, wiki, forum). People who develop elRTE and elFinder also develop commercial projects therefore it is good to have all development in one place. Btw elFinder was started not "just for fun" but as commercial need.
> About elRTE, do you plan to integrate it with elfinder and python as well? elFinder integrates well with elRTE here is doc http://elrte.ru/redmine/projects/elfinder/wiki/Integration_EN elRTE is pure javascript so no need to integrate it with python, maybe only write a little helper. About Spanish, I don't speak it. Spanish translation is done by one of our contributers who live in Spain and now he is stuck with Java connector. Our team is all Russians and have difficulties speaking/ writing English, except me (I'm not russian but Russian is native language to me). I'm responsible for all non-russian communication. elRTE and especially elFinder are now well known in Russian IT community and market, some big companies already integrated elFinder in their products but this is not true for the rest of the world. Maybe you can give some advices how or where to promote our open source projects. I really believe we can hit the world with our projects.

