Eclipse 4.2 and 4.3 user can try my plugin: http://zulus.github.com/extjs-eclipse
It's on BSD license.
Current version support basic code assist.
Nice one Zulus.
It's nice to see people like You to share Your work with other developers.
Sadly Sencha isn't thinking about developers as they should.
Just look at forum. No public repo, very long time between public releases, even cdn links are not working.
Thanks to community and people like You this product is getting better.
Sencha Premium Member