AmericanBibleSociety

If you are doing screen design with clients or a team I can't recommend Figma enough. It has really changed the way we work together. Yes, Illustrator still has really nice vector creation tools but we've totally removed it from our daily workflow.

[$$$ Pay Per Test] We've recently used UserTesting to get quick feedback on a completely new UI for bibles.org. UserTesting

The most useful screensharing and voice collaboration tool on our machines. It makes sharing what you are working on at the moment very easy. Screenhero

We employ HockeyApp to test new builds for our mobile applications. It makes it very easy to send out early builds for stakeholders to test. HockeyApp

[$99 One time purchase] We are currently learning Framer.js so that we can improve our rapid prototyping capabilites. Framer

[Free] We use this free Sass framework on just about any project that we work on. Bourbon

[FREE] We use middleman for its ease and speed to develop and deploy micro/marketing sites. Middleman

[$$$ One time purchase] Cool little tool to install on the Mac for docs of many libraries, frameworks, and coding languages. Dash

We are not currently using this product but we have very high interest in learning and using this for mobile apps. React Native

[Not currently used] We had hopes to employ this product as it has some very cool features. Customer.io