I'm writing a new cross-platform Common Lisp IDE.
Current features:
- REPL with command history and history substitution
- debugger prototype (show condition, list frames, invoke restarts)
- completion for lisp symbols and filenames in REPL
- find source in REPL
- swank-based inspector
- compilation error browser
- editor buffer list
- you can still run tcl code with special "escapes"
Most of the features listed are just prototypes, but I'm moving towards really usable IDE rather quickly.
https://bitbucket.org/budden/clcon/overview

IDE is a client-server application. Server is SWANK, client is in pure tcl/tk (some amount of tcl/tk code
is generated from SWANK). Permissive license.
Your help is welcome!