Partly based on the code i wrote for FUEL (see below), Geiser aims at replicating the slime experience on the scheme world. Work in progress, but several features are already functional for both Guile and MzScheme, and an Ikarus backend is in the back burner. No web page yet, but see this blog post for some details, or browse the code here.
Factor is an amazing language in the concatenative family. There're many things i like about it, but probably the one i find most enjoyable is its fully reflective environment, which in many ways evokes the Lisp Machines of yore. Given that, it was not too difficult to implement a nice Emacs interaction suite for Factor, which we called FUEL. It comes bundled with Factor itself, and you can see it in action in this nice screencast by Slava Pestov.
I'm the author of GNU MDK, which stands for GNU MIX Development Kit. It is an emulator of Don Knuth's MIX mythical computer, together with a MIXAL (MIX Assembly Language) compiler that produces assembly object files executable by the companion MIX virtual machine. It also allows debugging programs through step by step execution, breakpoint setting, symbol table inspection and manipulation of the contents of MIX's components (registers, memory cells and the like).
All of this can be done via a comfortable command line interface or, if you really are that kind of gal or guy, a gtk+ GUI. Last but not least, the whole enchilada is controllable, extensible and what not using the most beautiful programming language ever.
MDK comes in handy for readers of The Art of Computer Programming, although you can learn MIX/MIXAL directly from the MDK manual, which has been published by the GNU Press.
I maintain a blog devoted to the Emacs operating system called minor emacs wizardry. In addition, you can find my Emacs configuration files (together with other configuration bits) in this git repository.
As you'll see, i've got lots of customizations and elisp bits in there. Some of them have grown up to small packages and reusable code independent of my particular needs. Find them in the lib folder.
You can browse my darcs and git repos for an assortment of other experiments. Or read my programming musings for some random thoughts on programming and programming languages.