[pathartl]

For custom applications for clients we've been using Propeller (http://propeller.in)

It looks good (even if people think material is outdated) and is broken out into components. It does most everything we need and is based on Bootstrap.

[Bolduro]

I know Propeller and I think the guys did a great job there. My project will also be based on Bootstrap to make it easy to jump in for most devs. I've put the link to the waiting list below and I'd love to hear your opinion the moment it's out.