Update README.md

README.md

@@ -783,6 +783,7 @@ _Games, game servers and control panels._
 - [Hextris](https://github.com/Hextris/hextris) - Fast paced HTML5 puzzle game inspired by Tetris. ([Demo](https://hextris.github.io/hextris)) `GPL-3.0` `HTML5`
 - [Lila](https://lichess.org/) - The forever free, adless and open source chess server powering lichess.org, with official iOS and Android client apps. ([Source Code](https://github.com/ornicar/lila)) `AGPL-3.0` `Scala`
 - [Posio](https://github.com/abrenaut/posio) - Geography multiplayer game. `MIT` `Python`
+- [Openspades](http://openspades.yvt.jp) - Openspades is the first-person shooter in a destructible voxel world. ([Source Code](https://github.com/yvt/openspades), [Server Source Code](https://github.com/piqueserver/piqueserver)) `GPL-3.0` `C++/Python`
 - [RconCli](https://github.com/gorcon/rcon-cli) - CLI for executing queries on a remote Valve Source dedicated server using the RCON Protocol. `MIT` `Go`
 - [SourceBans++](https://sbpp.github.io) - Admin, ban, and communication management system for games running on the Source engine. ([Source Code](https://github.com/sbpp/sourcebans-pp)) `CC-BY-SA-4.0` `PHP`
 - [Spyfall](https://github.com/mpcovcd/spyfall) - Fan made web version of the Spyfall party game. ([Demo](http://spyfall.crabhat.com/)) `MIT` `HTML/Javascript`