Which free git GUI software support custom Gitlab servers?

My university uses Gitlab that is installed on a university server. I am able to log in and use that Gitlab server through the web. Which free git GUI software support custom Gitlab servers?

All of them should. The mere act of cloning a repo, pushing a commit, etc. requires that you specify a remote server so yeah all of them should.

Which one is most simple to use? All functionality that is needed is to update local repo to the current state of the remote repo and push changes from the local repo to the remote repo.

I think for simple tasks you need no GUI at all, but maybe this article is helpful, it compares two of the most popular programms.

GUI Software Supports custom Gitlab servers. Printer. If you have any problems related to HP Printer then please contact our HP Support Assistant to solve your problems.