TITLE: Graphical interface in GAP
QUESTION [5 upvotes]: Is there any graphical interface in GAP? Something like RStudio for R or WxMaxima for Maxima. I'm using GAP under a Linux system.
Thanks

REPLY [4 votes]: I want to follow up on Alexander's answer.  Gap.app, which is one of the Undeposited Implementations for GAP that Alexander mentions briefly, is back in active development, with a new release this week.  It is a front-end and GAP distribution for macOS.  It fully supports the xgap library, and also does some other useful things like provide easy save and load of sessions, command completion, etc.  See
https://cocoagap.sourceforge.io/ .
(Disclosure:  I am the author of this program.)
Here's a nice screenshot from Samuel Lelièvre:

Unfortunately, if you're on Linux, Gap.app doesn't currently help you so much.  Gap.app uses Objective C, and there is reasonable potential for compiling under Gnustep or similar.  I have an undergraduate looking at that possibility, and it is possible that he will make some progress.
By the way, xgap still largely works.  It uses the Xathena widgets, so does look and feel very dated.  There is a bug in the current release of GAP that affects xgap (and prevents most display), but you can work around it by typing GAPInfo.TermEncoding:="latin1"; as your first command in a session.
One more thing.  Alexander attributes xgap to Max Neunhöffer.  The project was actually originated by Frank Celler, and taken over by Max Neunhöffer when Frank left mathematics.  Now Max Neunhöffer has also left mathematics, and xgap maintenance is handled by Max Horn.