Light Table
Chris Granger’s development environment (Note: People have felt that this does not belong here. However, I feel the immediate visual feedback provided within Light Table warrants it being listed here).
Lily
Really cool和hard to describe. You need to visit their demo web page和watch their videos.
Limnor Studio
Little Big Planet
Someone built an An 8-bit Mechanical Adder in LittleBigPlanet
MAX/MSP Jitter
Minecraft
Considering someone has created a fully programmable computer using Minecraft.
Minibloq
This has a really cool looking interface.
Morphic
Mozilla Appmaker
This was discussed quite a bit on Ycombinator.