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[MrFlibble]

I'm not aiming to create huge, comprehensive lists like those that can be found at Wikipedia, Liberated Games or Remain in Play, rather, just to document the various (and sometimes rather obscure) free and/or liberated game findings that could be of certain interest

Action

• Legend of the Silver Talisman
• Operation Carnage

Adventure

• Bronze Dragon: Conquest of Infinity & Dragon Side II: The Twisted Speare
• Robomaze III [download]

Fighting

• Battle of the Eras
• Sango Fighter 2

First-Person Shooter

• Hades 2 [download]

Platform Game

• Robomaze II: The Lobby [download]

Puzzle

• Get Lost!

Real-Time Strategy

• Iron Seed [open source]
• Onimod Land [download]
• Seven Kingdoms: Ancient Adversaries [open source]

Role-Playing Game

• Amulets & Armor
• Blades of Exile [open source]
• Exile: Escape from the Pit
• Exile II: Crystal Souls
• Exile III: Ruined World
• Helherron
• Joyous Rebel
• Lords of Doom
• Perihelion
• Pyrrhic Tales: Prelude to Darkness
• RuneSword
• RuneSword II [open source] [download latest version]
• ShadowFlare: Episode One [discontinued]

Shooter

• Evasive Maneuvers
• SideLine
• Tiger's Bane

Space Combat

• LineWars II

Turn-Based Strategy

• Battles of Destiny
• Conquest of Elysium II [download]
• Star Lords [download]

Turn-Based Tactics

• Rapid Response [download]
• The War Engine

[MrFlibble]

Iron Seed
This rather unusual sci-fi strategy game that had originally been released as shareware can be found at the official website of the original developers, who are now working on a remake:
Iron Seed Downloads and Manual
Latest game patches

Theseus - Return of the Hero
A follow-up of Alien Shooter with a different protagonist, and running on the same engine. The game was released for free by Sigma Team at some point, and is available from their website:
Download Theseus - Return of the Hero

[MrFlibble]

Legend of the Silver Talisman
Originally a shareware game inspired by Gauntlet, the full version of the Legend of the Silver Talisman was eventually released as freeware by the developers.
Download Legend of the Silver Talisman from Inter-Active Arts

[MrFlibble]

Perihelion
Edvard Toth, author of the Amiga role-playing game Perihelion, has been very kind to distribute the full version at his website. With the original publisher no longer existing, this is the closest thing to an official liberated release of the game.

The download comes with a preconfigured Windows emulator.

[MrFlibble]

Amulets & Armor is now officially free.

[MrFlibble]

Tiger's Bane by Longbow Digital Arts.

Tiger's Bane is a hybrid of the shoot-em-up and simulation genres, combining side scrolling action with realistic elements such as limited ammunition, accurate modelling of weapons and their effects, flight dynamics that take inertia and wind into consideration, and a wide array of real battlefield machinery to fly, destroy, and protect.

[MrFlibble]

Somehow it doesn't seem to be widely known that the registered version of LineWars II is available as a free download from the website of its creator, Patrick Aalto:
http://linewars.patrickaalto.com/

[MrFlibble]

Helherron, a classic style shareware RPG by Antti Kuukka, had been released as freeware in March 2006. The official website is down, but there's a functional archived copy where the latest, free version of the game (v2.04) is available:

• Windows version: helh-2.04-win.zip
• Linux version: helh-2.04-linux.tar.gz

[MrFlibble]

I've reorganized the list in the OP, and also added the following titles:

Action

• Operation Carnage

Puzzle

• Get Lost!

Role-Playing Game

• Joyous Rebel

Shooter

• Evasive Maneuvers

Turn-Based Strategy

• Star Lords [download]

Turn-Based Tactics

• The War Engine

[MrFlibble]

Adventure

• Bronze Dragon: Conquest of Infinity & Dragon Side II: The Twisted Speare

Role-Playing Game

• RuneSword
• RuneSword II [open source] [download latest version]