The best Social Network alternative to Kohlchan is Lainchan, which is both free and Open Source. If that doesn't work for you, our users have ranked nine alternatives to Kohlchan, but unfortunately only two of them are Social Networks.
Lainchan is a great imageboard package, actively building on it and adding a lot of features and other improvements. This imageboard's topic focused to anime, manga, politic, and technology.
Lainchan is the most popular Open Source alternative to Kohlchan.
8chan.moe's goal is to recreate the feeling of freedom and camaraderie that once blessed imageboard users in the year 2014. Many users have lost their Internet homes to the current cultural shifts in the electronic landscape, and we want to give the best of them a place...
