Vrapper is an Eclipse plugin which acts as a wrapper for Eclipse text editors to provide a Vim-like input scheme for moving around and editing text. Unlike other plugins which embed Vim in Eclipse, Vrapper imitates the behavior of Vim while still using whatever editor you have opened in the workbench. The goal is to have the comfort and ease which comes with the different modes, complex commands, and count/operator/motion combinations which are the key features behind editing with Vim, while preserving the powerful features of the different Eclipse text editors, like code generation and refactoring.
Evergreen is a cross-platform development environment that tries to be lightweight and language-agnostic yet functional. It started as a project to reimplement Rob Pike's Acme editor for Plan 9 in Java, but has since evolved in directions that help it deal with large codebases and multiple projects/branches at once. Remaining similarities include the tiled windows and the Unix-like reliance on external programs rather than reinventing every wheel. The major philosophical differences include strong support for keyboard-based editing, language-specific functionality, and native platform UI conventions. There are also two new guiding principles: accepting regular expressions and output diffs.
Java Tools is a lightweight IDE for creating, compiling, executing, and debugging Java applications and applets. It includes point and click access to the Java commands, documents, directories, and files. It also includes a built-in text editor and user interface for the Java debugger. It makes learning and using Java easier. It's for the new Java user who needs help getting started, as well as the more experienced Java user who wants easy access to the Java commands and a text editor.
NbGit is a module for the NetBeans IDE that adds support for working with the Git version control system. It uses the JGit library created as part of EGit to interact with Git repositories. Because the module is pure Java code, it should work better across different platforms, modulo platform specific differences, such as file system behavior.
Arcadia is a Light Integrated Development Environment (IDE) for the Ruby language written in Ruby using the classic Tcl/Tk GUI toolkit. Some features include an editor with source browsing, syntax highlighting, and code completion, debug support, the ability to work on any platform where Ruby and Tcl-Tk work, a highly extensibility architecture, and support for RAD GUI building.