1. Icons made by Freepik from www.flaticon.com are licensed by Creative Commons BY 3.0.
2. Music 'Asian String Suite' made by BossLevelVGM from The Open Game Art Bundle, is licensed by Creative Commons BY 3.0
3. GNU Go is a free software program by the Free Software Foundation that plays Go. It is licesnsed by GNU General Public License version 3 (GPL v3). Source code can be found at gnu.org.
4. KataGo is a open source program by lightvector. It is licesnsed by Open Source License. Source code can be found at github.com.