avocode - Centralize design collaboration, version control, prototyping, feedback, and developer hand-off with Avocode. Work on any design, anywhere, with anyone. Sign up free 👉 https://avocode.com/.
UpEffect - Crowdfunding for social good products
Undesign - Free design tools and resources for your projects
Creddon - Tweet for a cause and a sponsor will donate $1 to charity
2015 Design Tools - Results from survey of 4,000+ designers on their fave tools.
Public Design Vault - 500+ design tools for public good, all in one place