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The Humble Store has a Space Weekend Sale live at their site.
Alien: Isolation $17 (Steam)
Beyond Space $1 (Steam)
Cosmonautica $9 (Steam)
EVE Online Premium Edition $25
EVE Online: Colonist Add-On $2.49
EVE Online: Core Starter Pack $4
EVE Online: Explorer Add-On $2.49
EVE Online: Industrialist Add-On $2.49
EVE Online: Skirmisher Add-On $2.49
Fractured Space: Forerunner Pack $7.49 (Steam)
Fractured Space: Harbinger Upgrade $15 (Steam)
Interstellar Marines $6.45 (Steam)
Kerbal Space Program $18 (Steam)
Lunar Flight $2 (Steam)
Out There: Ω Edition $9 (Android, DRM Free)
PARTICLE MACE $4.49 (Steam, DRM Free)
Space Hulk $5 (Steam)
Space Hulk Ascension $18 (Steam)
Space Pirates and Zombies (S.P.A.Z.) $2 (Steam, DRM Free)
Space Run $3.74 (Steam)
SPACECOM $3.74 (Steam, DRM Free)
Strike Suit Infinity $1.39 (Steam)
Strike Suit Zero $5 (Steam, DRM Free)
Systems Nominal $0.74 (DRM Free) – All proceeds from Systems Nominal go to charity: water and American Red Cross.
The Swapper $3 (Steam, DRM Free)
Universe Sandbox $2 (Steam, DRM Free)
Void Destroyer $9.74 (Steam, DRM Free)
X Superbox $10 (Steam)
Xeodrifter $8 (Steam)