I think it's on F-Droid. I can throw it on my smartphone to test it out, but I don't use any applications that depend on Gapps. What applications do you need it for?
EDIT: It seems to work fine. I do have Signal which can use Google Play Services, but it didn't detect it. I'm still running a Marshmallow base and didn't really have any software that tried to use it. I don't know how helpful that is.