Spinym - Ask questions anonymously
SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.
Startups Anonymous - Anonymously ask questions and share stories. AA for Startups
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
Wisdo - Learn from people who’ve been there
NumWorks - The graphing calculator that makes learning math easier.