Digtwit is a very simple tool that checks for a hashtag (e.g. #digmia) in a user's friends feed on Twitter and retweets any messages mentioning that hashtag automatically. By following a user, you allow a user to be included in automatic retweets.

This version added support for the new Twitter API and upgraded all underlying libraries. It also uses new style retweets (without "RT ...").

Digtwit – Freecode