Saturday morning software tools roundup

Stuff I recently saw which intrigued…

* “GeometricTools”: (via @donpark) — great repository of code snippets for math and geo operations.
* “How to find freely usable photos on the net”: — excellent tips, I’d been using Wikimedia Commons as well (thanks @ellegold)
* “The Lean Startup Bundle”: OK I hope to gosh I would never need all these things but some good ideas in here
* Step by step diffeq solutions in “WolframAlpha”: What a resource.
* Charlie Kindel articulates “why I need to flip to Powershell”: on my Windows box. He also makes a strong case for switching to “Sublime Text 2”: