RosettaGit isn't the only project which aims to document tasks in multiple languages. Other projects do exist. Here's a list. Feel free to update and add to it.

Live sites

Multi-Task efforts

Specific Tasks

Humorous

Archive

These sites were online at one point, but have since vanished with no forwarding address. If you know of online, existing archived copies, please link to them. Also, Rosetta Code may be interested in hosting static copies of such sites where they're at risk of disappearing. Having such content disappear is counter to the goals of this site.

If a site is listed in this section, but is actually still live, please move it back to the live section.

Algorithm Wiki

CodeUU

NoCruft