Grargar: <span class="bold">The Humble Clickteam Fusion 2.5 Bundle</span> $1
Clickteam Fusion 2.5 Standard + a Steam coupon for $50.00 dollars off of a Developer upgrade (Steam, Windows)
Rock Rock Rocket Source Code
Oniken (DRM-Free/Steam, Windows/Mac/Linux)
Plantera (Steam, Windows)
Tick Tock Isle (DRM-Free/Steam, Windows)
Necromonads + Source Code (Steam, Windows) $7
Universal Windows Program Exporter (Steam, Windows)
The Yawhg (DRM-Free/Steam, Windows)
Five Nights at Freddy’s 3 (Steam, Windows)
Quadle + Source Code (Steam/Android, Windows)
room13 (Early Access) + Source Code (Steam, Windows) $15
Clickteam Fusion 2.5 Mac Editor (Mac)
Concrete Jungle (DRM-Free/Steam, Windows)
HTML5 Exporter (Windows)
Saucer Squad Source Code
Fusion Shapes Source Code
Environmental Station Alpha (DRM-Free/Steam, Windows/Mac)
Install Creator Pro (Windows)
iOS Exporter (Steam, Windows*/Mac*)
*The Steam key is Windows-only, while the Clickteam Fusion key is Mac-only.
I think it's probably the first time that Humble features a bundle with a minimum of $1 even for DRM-Free games.
The iOS exporter at the top level is nice, strange that there's no Android module, though.