Redmine is a flexible project management web application. Written using Ruby on Rails framework, it is cross-platform and cross-database.
Redmine is open source and released under the terms of the GNU General Public License v2 (GPL).
"This is 'add'; place an existing file in the index. When you do not want it in the index, you 'un-add' it.
* [3]$ git rm --cached a-new-file
This removes the entry from the index, without touching the working tree file."