The open source clones of Alpha Go are my favorite AI sparring partners. There are several to choose from, and also several Go board applications.
My favorite open source Alpha Go clone is Katago https://github.com/lightvector/KataGo.
There are several different open source Go board/sgf editor applications on which to run Katago; I use several.
KaTrain is my favorite: https://github.com/sanderland/katrain
I also use sabaki: https://github.com/SabakiHQ/Sabaki/releases
and q5Go: https://github.com/bernds/q5Go
for batch review of Go games goreviewpartner is good: https://github.com/pnprog/goreviewpartner
