YASnippet-on-GitHub is a project mainly written in ..., it's free.
This is a clone of the svn out on code.google.com
YASnippet re-design and re-writing of my original extension smart-snippet. The goal is ease of use and full features.
For detailed document, you can either download the document release of YASnippet or view it directly online:
http://pluskid.lifegoo.com/upload/project/yasnippet/doc/index.html