The Emacs package ANTLR-Mode provides: syntax highlighting for ANTLR grammar
files, automatic indentation, menus containing rule/token definitions and
supported options and various other things like running ANTLR from within
Emacs.
RSLisp is a new dialect of Lisp which works on the NET Framework with a special compilation/interpretation model. If you wish you can download the source and build it yourself for Linux (requires Mono Framework), but I don't promise that it'll work
xacc.ide is a opensource IDE aimed at mainly .NET development. It has a code editor written in 100% C# code, which is faster than most commercial offerings.
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kin is a set of libraries and tools supporting meta-programming for engineering and technical computing applications. This JVM version of kin has been superseded by the stand-alone version being developed at http://purl.org/net/kin.
Etiquette is an interaction protocols construction tool. Etiuqette allows to describe communication in high-level and textually condensed fashion. Built-in support for debugging and error-handling policies is provided. Etiquette is written in Common Lisp.
Freefactor is a Java refactoring framework. It consists of a tool-independent refactoring system and an interface to allow it to be integrated with other tools. Currently a prototype Java-based tool is provided as well as bindings for Emacs.