added new entries

games/action/_toc.md

@@ -18,8 +18,13 @@
 - **[GLtron](gltron.md)** (C, GPL, beta, inactive since 2016)
 - **[Gang Garrison 2](gang_garrison2.md)** (Game Maker Script, MPL, mature)
 - **[Linwarrior 3D](linwarrior.md)** (C++, Apache-2.0, mature, inactive since 2010)
+- **[Liquid War](liquid_war.md)** (C, GPL-3.0, mature, inactive since 2015)
+- **[Lugaru](lugaru.md)** (C++, GPL-2.0, mature)
+- **[Maelstrom](maelstrom.md)** (C++, GPL-2.0, mature, inactive since 2002)
 - **[MechCommander 2 Omnitech](mechcommander2_omnitech.md)** (C++, MPL, beta, inactive since 2013)
 - **[Netrek](netrek.md)** (?, mature, inactive since 2009)
+- **[Neverball](neverball.md)** (C, GPL-2.0, mature)
+- **[Nexiuz](nexiuz.md)** (?, mature)
 - **[Open Sonic](open_sonic.md)** (C, GPL-2.0, beta)
 - **[Open Zelda](open_zelda.md)** (C++, zlib, beta)
 - **[Red Eclipse](red_eclipse.md)** (C++, zlib, mature)

games/action/liquid_war.md

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+# Liquid War
+
+_Multi-player action game based on particle flow mechanic._
+
+- Home: https://ufoot.org/liquidwar/, https://www.gnu.org/software/liquidwar6/, http://savannah.gnu.org/projects/liquidwar6
+- Media: https://en.wikipedia.org/wiki/Liquid_War
+- State: mature, inactive since 2015 
+- Download: http://download.savannah.gnu.org/releases/liquidwar6/
+- Platform: Linux
+- Keywords: multiplayer
+- Code repository: https://git.savannah.gnu.org/git/liquidwar6.git
+- Code language: C
+- Code license: GPL-3.0
+
+## Building
+
+- Build system: Autoconf

games/action/lugaru.md

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+# Lugaru
+
+_Cross-platform third-person action game with an anthropomorphic rebel bunny rabbit._
+
+- Home: https://osslugaru.gitlab.io/, http://blog.wolfire.com/2010/05/Lugaru-goes-open-source
+- Media: https://en.wikipedia.org/wiki/Lugaru
+- State: mature
+- Download: https://osslugaru.gitlab.io/
+- Platform: Windows, Linux, macOS
+- Code repository: https://gitlab.com/osslugaru/lugaru.git
+- Code language: C++
+- Code license: GPL-2.0
+- Code dependencies: SDL2, OpenAL
+- Assets license: CC-BY-SA-3.0
+
+## Building
+
+- Build system: CMake
+- Build instructions: https://gitlab.com/osslugaru/lugaru/blob/master/COMPILING.md

games/action/maelstrom.md

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+# Maelstrom
+
+_Enhanced clone of Atari's 1979 Asteroids arcade game with a visual style similar to Atari's 1987 sequel, Blasteroids._
+
+- Home: https://www.libsdl.org/projects/Maelstrom/
+- Media: https://en.wikipedia.org/wiki/Maelstrom_(1992_video_game)
+- State: mature, inactive since 2002
+- Download: https://www.libsdl.org/projects/Maelstrom/binary.html
+- Platform: Windows, Linux, macOS
+- Keywords: arcade, shooter
+- Code repository: (see https://www.libsdl.org/projects/Maelstrom/source.html)
+- Code language: C++
+- Code license: GPL-2.0
+- Code dependencies: SDL
+- Assets license: CC-BY-3.0
+
+## Building
+
+- Build system: Autoconf

games/action/neverball.md

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+# Neverball
+
+_Part puzzle game, part action game, and entirely a test of skill._
+
+- Home: https://neverball.org/
+- Media: https://en.wikipedia.org/wiki/Super_Monkey_Ball_(video_game)#Legacy
+- State: mature
+- Download: https://neverball.org/download.php
+- Platform: Windows, macOS
+- Code repository: https://github.com/Neverball/neverball.git
+- Code language: C
+- Code license: GPL-2.0
+
+Inspired by Super Monkey Ball.
+
+## Building
+

games/action/nexiuz.md

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+# Nexiuz
+
+_First-person shooter video game._
+
+- Home: http://www.alientrap.com/games/nexuiz/, https://sourceforge.net/projects/nexuiz/
+- Media: https://en.wikipedia.org/wiki/Nexuiz
+- State: mature
+- Download: https://sourceforge.net/projects/nexuiz/files/
+- Platform: Windows
+- Keywords: shooter
+- Code repository: (not found yet)
+- Code language: ?
+- Code dependencies: DarkPlaces (Quake engine https://github.com/xonotic/darkplaces)
+
+## Building