Steno is a native GUI application for analysing articles. Fulltext search queries are supported, and articles may be tagged. Collected articles can be ‘slurped’ down from a server.
Grab a copy on the downloads page.
Source code is at: https://github.com/bcampbell/steno
This is a tool for bulk-comparing sets of articles. Given two sets of articles, it generates an HTML report showing articles which look similar.
It comes in two flavours: a commandline version and one which has a little GUI to help set the various options.
No real documentation yet, but the commandline version has a README with a few clues.
The source code for both cli and gui flavours can be found in the steno repository on github.