Browser Game Engine

Miscellaneous Forums/General Discussion/Browser Game Engine

If you should create a browser game like travian, what would you use?
And what should be the main features of the engine?

I've done a simply one only using html+php+javascript.

PS: Flash can't be considered as it's not free.
PPS: sorry for my english if i've made mistakes (you can correct me so i can know my mistakes)