Infinifactory (tuxdb.com)

Infinifactory is a sandbox puzzle game by Zachtronics, the creators of SpaceChem and Infiniminer. Build factories that assemble products for your alien overlords, and try not to die in the process.

LIKE SPACECHEM… IN 3D! Design and run factories in a first-person, fully 3D environment.
HISTOGRAMS ARE BACK! Optimize your solutions, and then optimize them more when you see how much better your friends did.
VISIT EXOTIC ALIEN LOCALES! Explore a story-driven campaign with 50+ puzzles, audio logs, and more.
BLOCKS THAT MOVE! Go beyond the campaign and push the limits of Infinifactory’s next-generation block engine in the sandbox.
STEAM WORKSHOP INTEGRATION! Create, share, and play custom puzzles on Steam Workshop.

Last Call BBS - The last game by Zachtronics!

Boot up your Z5 Powerlance and dial into Last Call BBS, the last game from Zachtronics!

The Barkeeps loaded up his retro computer with a full set of puzzle games for you to download and play. No need to worry about copy protection, theyre all fully cracked and ready to enjoy!
Includes eight full games:

20th Century Food Court: Design factories to produce food just like they did over 700 years ago in the 20th century. Keep your costs low and your machines running fast!
STEED FORCE Hobby Studio: Assemble robot models based on the anime smash hit Steed Force right on your computer. No sandpaper required!
XBPGH: The Forbidden Path: Enter a cursed world and create bizarre flesh sculptures in exchange for eternal life. The master is pleased but can you trust him?
Sawayama Solitaire: It wouldnt be a Zachtronics release without a brand-new solitaire game. This time its a fresh take on Klondike, the classic solitaire variant.
Dungeons & Diagrams: Try your hand at these beguiling tile-based logic puzzles. Can you map out the dungeons and steal all the treasure?
ChipWizard Professional: Build integrated circuits using wires, transistors, and capacitors. Wait a second, is this a game or a CAD program?
HACK*MATCH: The tile-matching minigame from EXAPUNKS, completely remastered with a single player campaign and local head-to-head multiplayer (with Steam Remote Play support).
Kabufuda Solitaire: Create matching sets of Japanese kabufuda cards in this retro-demake of the challenging original solitaire game that debuted in Eliza.