Open Source Nipper repository

Note: Latest commercial version found here.
The versions below are out of date.
And, they are not maintained or supported by anyone.

Nipper info and guides:
Quick overview and usage guide

GPL nipper:
0.10.10 source code

Nearly GPL nipper:
0.12.6 Windows Binary
0.12.6 Library Src
0.12.0 CLI Src