https://www.indiegala.com/birthday2015

Gun Metal currently free

Dead Bits is free on Indiegala Store.

Giants: Citizen Kabuto is free on GOG for a couple of days: http://www.gog.com/game/giants_citizen_kabuto

https://www.indiegala.com/store

Incoming Forces currently free

Awesome, I had been wanting to get these on Steam, thanks!

Aveyond: Gates of Night free here:

http://www.pcgamer.com/grab-a-free-steam-key-for-rpg-aveyond-gates-of-night/

Eventually I'm going to play one of those RPG Maker style RPGs like Aveyond. Anyone know if that's a good one to get started with?

Worms Forts: Under Siege is free on GOG right now. Looks like it only lasts a few days though.

http://www.gog.com/game/worms_forts_under_siege

These have been free before, but they're free again

Platypus II

https://www.indiegala.com/store#giveaway

Enemy Mind

http://www.pcgamer.com/grab-a-free-steam-key-for-arcade-shooter-enemy-mind/

Bio Menace is free on GOG (no time limit)

http://www.gog.com/game/bio_menace

Murder Miners is free from Bundle Stars / Indie DB (looks like you have to do some social media stuff, not sure)

http://www.indiedb.com/games/murder-miners/features/murder-miners-free-game-giveaway

Seeing as Omikron is a bounty, Squeenix decided to make it easier to complete for those of us who didn't own it. You can get it for free from the Squeenix Store using the promo code "omikron" after you add it to your cart. It's a steam key.

https://store.na.square-enix.com/product/281956/omikron-the-nomad-soul-pc-download

Wow, that's pretty awesome of Square, actually. I went ahead and picked it up since I don't have the game on Steam. Perhaps I should join in the bounty...hmm...

Yes...Yes, you should!

Soulbringer is currently free on indiegala

https://www.indiegala.com/free2play#giveaway

Thanks for the heads up on Omikron. I saw the offer being talked about before, but where I saw it said it was an EU only offer.

https://www.indiegala.com/trades#giveaway

Street Racing Syndicate currently free

Sweet, thanks! I've been interested in Street Racing Syndicate.

Bionic Dues is free on Humble right now: https://www.humblebundle.com/store/p/bionicdues_freegame

If you "buy" Fractured Space on Steam before Monday, it's yours to keep: http://store.steampowered.com/app/310380

Story about this here: http://www.pcgamer.com/sunless-sea-and-fractured-space-are-free-on-steam-this-weekend/

Thanks for the heads-up on Fractured Space! I saw it was free this weekend, but just assumed it was the standard free weekend deal.

Origin's "On The House" game has flipped over, right on the day of the 10 week period they've mostly adopted lately.

The current offering is "Need for Speed: Most Wanted" (2012).

If the current trend of 10 week rotations holds out, next game should be April 12th.

Timberman is currently free on indiegala

https://www.indiegala.com/#giveaway

Consortium: Master Edition is free on GOG for 48 hours (It's shown at the top of the GOG homepage). http://www.gog.com/

Endorlight currently free

https://www.indiegala.com/#giveaway

Golden Axe
Jet Set Radio
Hell Yeah! Wrath of the Dead Rabbit + DLCs

http://store.steampowered.com/sub/94153/

There'll be more freebies to come every 2 days.

Round 2: Streets of Rage 2, Binary Domain, Condemned: Criminal Origins
Round 3: Gunstar Heroes, Renegade Ops, Viking: Battle for Asgard