Handy online visualiser for json data. Can get slow with large files, but it's useful nonetheless.
A script to set up and deploy django servers. Hat tip rob.
Funky open source web app around task management that syncs and has a client across Mac, Win, iPhone, Android. Apparently no linux support. Built on top of Titanium from appcelerator.
Developer APIs for placing calls and sending SMS messages. Handles both incoming and outgoing, but only sends texts in the US and only has incoming US / Canadian numbers.