Game engine and development tools

Hi,

First of all, I really enjoyed playing Machinarium, in fact me and my wife enjoyed playing it and had lots of fun moments with game. So many thanks for creating wonderful games.

Just out of curiosity, what kind of game engine and development tools did you use for making Machinarium (or other games you develop)? I would like to start a hobby project and was looking around and reading about available development frameworks for games (both open source and commercial), so your input is extremely valuable to me.

Have fun and keep up creating excellent art!
Ymer