Ruby Toolbox - Explore and compare open source Ruby libraries
Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.
Control Illustrations - 108 free flat illustrations with customizable characters
LibHunt - LibHunt tracks mentions of software libraries on relevant social networks. Based on that data, you can find the most popular projects and their alternatives.
Humaaans - Mix-&-match illustrations of humans with a design library.