End-to-end HTTP and REST API testing for Go
Java GUI-Less browser, supporting JavaScript, to run against web pages
Test HTTP webhooks with this handy tool that displays requests
tom_core - a tool for automating events on a computer
Random data generator: secure character streams and large files
A free IDE for C#, VB.NET, & Boo projects on Microsoft's .NET platform
Disk diagnostic for disk/controler/driver testing