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MechWarrior 2: Mercenaries

Standalone expansion based on MechWarrior 2: 31st Century Combat. Take command of a mercenary unit and play a pivotal role in major battles.

Redline

Sign up with The Company and get revenge on the Red Sixers in this post-apocalyptic action game.

Nanosaur Extreme

Updated edition of Nanosaur. Go back in time to rescue dinosaur eggs.

Army Men: RTS

Real-time strategy entry in the Army Men video game series.

Stronghold Crusader HD

Free update for Stronghold Crusader which adds support for widescreen resolutions.

Yosumin!

"Yosumin!, Square Enix's puzzle masterpiece, is here! Simply select rectangles of the same type of yosumin to make them disappear in this simple yet challenging puzzle game." - Steam store page

Earth 2140

Second game in the Earth series of real-time strategy games.

This is the original release sold at retail and on GOG.com and also bundled with the Steam HD version as "classic".

Echelon (2001)

First game in the Echelon series of sci-fi space combat games.

Underrail

No map or fast travel in this isometric RPG with turned-based combat. Underrail values exploration so much that the default progression system relies solely on finding special items (called oddities) instead of piling up experience points for every critter killed or quest completed. The game is not shy on dialog and characterization, but its heart beats for combat, crafting and the endless possibilities of stealth, brute force, traps or psychic warfare in a subterranean wasteland rife with loot and danger.

Shadow Warrior

Japanese-themed FPS game made using the Build engine. Later followed by a reboot series.