The Blue Tubes plug-ins have a brickwall limiter. There are also several free ones, like George Yohng's W1. This emulates Waves' original multiband maximizer. Overall, though, I've found no better multiband maximizer than the Waves L3 MultiMaximizer. The Concrete Limiter is great, but it's not multiband so it works best with individual tracks, not mixed program material although it can be used for that if you want more of a "straining" vibe.