Vicare Scheme

Vicare Scheme is an experimental fork of Ikarus Scheme; “Vicare” is pronounced the etruscan way. While the long term aim of the project is still not clearly established, Vicare has the following short and midterm goals: fix bugs; push compliance with R6RS, keeping a pragmatic eye at issues; enhance the POSIX interface.

The thing is that Ikarushasn’t been maintained and Aziz seems to be busy with other things.

(via marcomaggiviaikarus-users)

Do Scheme implementors take hygiene seriously?

Even the vast majority of Scheme systems, the platform that has experimented the most with hygiene, provide unhygienic defmacro-style macros—presumably because not even Scheme implementors take hygiene very seriously.

— Let Over Lambda, Chapter 6
Hygiene is in the standard here.
(via Racket-users)