Useful Hyperspace Jumps to good BIM sites, and even better Space sites.
BIM
The Building Coder – all your Revit API & mountaineering wisdom needs.
Dynamobim.org – my new favourite place (except for Space). For all things Dynamo.
LEGO Digital Designer – The best BIM software available today. No; really. Srs.
Autodesk – your favourite BIM software purveyor. My favourite is LDD, above.
Graphisoft – that other BIM software purveyor.
Dassault Systemes – that other other BIM software & multi-role fighter aircraft purveyor.
Slopes & Gradients – so simple, yet so many are confused. This will show you How To Do It.
Space
NASA – geek heroes, doing great science on a shoestring budget.
Space-X – geek heroes, doing great engineering on a slightly better budget.
Astronomy Picture Of The Day – APoD
Elite Dangerous – The space game.
Kerbal Space Program – BIM: In Space. More frequently; Boom: In Space.
Space Junk
LEGO – gets listed twice because LEGO!
XKCD – wisdom in single frame comic form.
Arch Daily – Architecture for hipsters; good for a laugh.