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)
A little note. If you go to the GitHub repository, you will see that the “master” branch has not been updated since May. To get the up-to-date version, either choose from the “Switch branches” menu the “devel”/”ikarus” branch.