Zzap is a microblogging server software for small groups in PHP. It's main features are Support for web, mobile phone and iPhone, photo upload and link-shortener. There also a bridge for twitter and blogs.
Google Map GPS Cell Phone Tracker tracks a GPS enabled cell phone on Google maps. Project includes J2ME cell phone source and source code to display data on your own website. Choose between .NET and MS SQL Server or PHP and MySQL.