Bitly is a link shortening service that also helps you share, track, and analyze your links. Now includes "bundles" which can be public or private, to gather your links by categories you choose. A social network style feed of other people's bitly links can be added to your dashboard.

An iOS app is available for iPhone. Wordpress plugin and API are available. Site includes a sub-site about the API for developers here: dev.bitly.com

MantisBT is a free popular web-based bugtracking system written in the PHP scripting language. The most common use of MantisBT is to track software defects. However, MantisBT is often configured by users to serve as a more generic issue tracking system and project management tool.

Features:

event-driven-plug-in system

works with MySQL, MS SQL, PostgreSQL, SQLite, Oracle and IBM DB2 databases

RSS Feeds

Customisable workflow

Wiki integration

Chat integration