By popular request (read: more than three poeple asked for it), here's some emojis:    
Couple more:    

Alright alright, here's some more!

Engines   

Tools      

Storefronts    

Last batch for today:     and to show my age,   

"Last batch"? Lies!

More engines:       

More platforms:       

And then,  just because I wanted to add that.

Some more:        

I never realized how unsuitable-for-emojis the Khronos logos are (details too tiny for small sizes, very non-square aspect ratios).

@aras
If we are going smaller in granularity you could give LDtk (https://ldtk.io/) as an Open Source, engine agnostic Level editor an Icon shout out, if you'd like. ^^
It's from the guy who made (among many other things) Dead Cells.
LDtk

LDtk (Level Designer Toolkit) is an open-source 2D level editor for indie devs, with a strong focus on user-friendliness.

@aras But what about geese?     
@esdin these would need a whole category for themselves, yeah! but also, hey not all emojis at once :)

@aras what about Defold? :D

(They're officially here on this instance  )

@aras If you have a chance, @construct should get one too!
@aras is there a vax emoji?! Thanks @aras
@poetaster @aras “Axe the Vax” was regularly pinned up on the CS notice boards when I was at Uni.
@poetaster kids these days would think it’s something about vaccines!
@aras could not resist: coco
I used to pilgramige to the local Radio Shack to try programs from byte magazine. Or the apple lle in the library. But I saved 2 summers for my commadore.
@aras Great to see some #zxspectrum love - thanks Aras! 
@TomF well that (or, a Lithuanian clone of a Russian clone of it) was my first computer, so!
@TomF @aras waaaaat. You’re almost making me consider switching to a client that shows emojis :P
@aras need the BBC Micro logo! And Electron 😂
@aras I see one popular 8-bit platform is still missing.