Thanks @HarrisPS 
Sub-q has published CSG’s. I’ve also got a second one called there called ocean’s call which is less recognisable as CS due to a colour mod. So far I think they’re the only two there, but they do accept CS submissions so there may be more in the future :).
Unfortunately there’s not a centralised database for CSGs. Due to the licence, most seem to be free games made for comps outside of the official publication lines. A few other places to look would include itch.io which has some hosted CSGs, mainly for game jams and comps. I’ve got a few hosted here, and I know @hustlertwo, @will and @nauhziy have short games published on that site via this link for a game jam there. (There could also be more I’m not aware of as it’s a popular Indi game hosting site.) Edit: both the games listed by Hannah are on itch, so there’s probably a lot more
There’s been a few submitted to IFComp over the years (including some that have placed very highly like the comp versions of Scarlet sails, Turandot and Creatures such as we) which means they remain accessible on their archive. There’s no easy way of finding which entries are specifically choicescript on the archive database that I know of though. Can try a search of this forum (sometimes entries are announced here) or go through the entry lists by year [here] (25th Annual Interactive Fiction Competition - IFWiki) on the ifwiki. If you know the year a game was published, you can find it on the IFComp website. Only issue with the ifwiki if you’re looking specifically for CSGs, is it sometimes lists them as “web browser” games instead of specifically choicescript.
I have seen a few finished projects hosted over a dashingdons (like counting spoons, there are others but their titles escape me at the moment.) Unless you know the names they can be tricky to find however as most are wips.
A tag search for choicescript on ifdb picks up a couple more from places like itch, introcomp, IFComp and personal websites (mixed in with COGs and HGs) https://ifdb.tads.org/search?searchfor=tag%3AChoiceScript&sortby=&pg=all
BTW thanks for bringing up alter ego. I’d missed that one. Will need to take a look