Open Peeps - A hand-drawn illustration library.
Netbeans - NetBeans IDE 7.0. Develop desktop, mobile and web applications with Java, PHP, C/C++ and more. Runs on Windows, Linux, Mac OS X and Solaris. NetBeans IDE is open-source and free.
Control Illustrations - 108 free flat illustrations with customizable characters
Eclipse - Eclipse is an open source community, whose projects are focused on building an open development platform comprised of extensible frameworks, tools and runtimes for building, deploying and managing software across the lifecycle.
Craftwork - A collection of User Interface resources made by Craftwork
IntelliJ IDEA - Capable and Ergonomic IDE for JVM