For now there's "only"
- Command line wallet: Win, Linux, Mac , BSD
- Java GUI for Command line wallet: Win, Linux, Mac , BSD
- Web wallet: for every OS with a browser
- Paymetheus GUI wallet for: Win
- Copay GUI wallet Fork for: Linux, Mac
in development a multiplatform GUI wallet for Win, Linux, Mac
https://forum.decred.org/threads/gui-wallet-windows-macos-linux.3866/