You have reached the prefics site on the internet. This place gather various projects favoring the prefix based programming languages in the Lisp tradition.
Of course the base project is a Scheme implementation which is at the core of the other projects. Take a look at the Project page for a descriptions of the other projects.
The Lisp tradition provided with time some wonderful packages and tools. The Lisp Machine (MIT CADR, Symbolics, TI Explorer, …) of course. Also we should not miss Emacs, the awesome editor.
The origins of many ideas in traditional AI is also linked to this tradition. Eliza the therapist started the design of the conversational interface we see today. Maxima needs to be cited as one of the first math software.
The various projects on this site tries to recreate some aspects of these softwares and ideas with the lenses of today.