Tools galore
Well, more than 905 tools (including 292 libraries) according to what I have referenced in SharpToolbox so far! How many do you actually know? ;-)
I started collecting this information more than three years ago now... It's been a while since I've taken a look at the counters.
If I remember well, the latest categories that I've added are Grid computing, Workflow, Rich-client UI. The categories with the most tools are IDE - IDE-addins, Persistence - Data-tier, Reporting, Object-relational mapping, and ASP.NET.
JavaToolbox is in good shape too with 558 tools including 196 libraries!
Searching for a tool? Keep digging, I have most of them in store :-)