It looks like a beta version of the Portal 2 Authoring Tools (Hammer map editor, etc.) are now live on Steam!

To install them, go to your Library and select Tools, and from there you can simply install and start using them!

To install them, go to your Library and select Tools, and from there you can simply install and start using them!
Also I see this is your first post iKonakona, you might want to refer to the Valve Developer community for learning how to map.
msleeper wrote:
If you guys are noticing what you might think are bugs, then I would really suggest you join the official Portal 2 Mappers mailing list and report them there. The new SDK is in "beta" so the only way to help is to report it to Valve.
Here's how the "tools" page looks on the mac version of steam 
iamafractal wrote:
[img]No_tools_for_Macs[/img]Here's how the "tools" page looks on the mac version of steam
I am so tempted to make a joke out of this. So tempted.