Muzli - UI/UX and Design Inspiration Chrome Extension
Open Peeps - A hand-drawn illustration library.
42matters Explorer - Explorer by 42matters is a research tool to visually explore databases of apps, publishers, audiences, SDKs, technologies, contacts and others.
Control Illustrations - 108 free flat illustrations with customizable characters
Apache Jackrabbit - Apache Jackrabbit content repository is a fully conforming implementation of the content repository for Java technology API.
DrawKit - MIT licensed SVG illustrations, in 2 styles