http://vladgsound.wordpress.com/plugins/
 
These two plugins have great potential. The are pretty complex, but I think you'll find their worth (with a little bit of manual reading). The Limiter no. 6 is very transparent while the Molot compressor adds a fair amount of color.

Has no one tried these yet? Your missing out in my opinion.

Too busy tracking with other new plugs but plan on trying it out at some point.

Tried molot a while back. To me, the GUI is a little bit confusing. I was never sure when the limiter was on or off. I was too lazy to RTFM to figure it out....... I have DL'd Limiter6 but haven't messed with it yet. from all the glowing reviews I've seen, I have high hopes for it.

Have not even downloaded them. Hence I have not tried them.

Yet.

I had chance to try Limiter no. 6 on a few projects today. Very useful limiter, tried it on the drum buss instead of Pro-L & was surprised that I could push it harder & was more transparent. Prefer using my own comps pre but the other stages work very well.
No problems to report using X1x64 (so far) 

No. 6 is an excellent limiter, although the UI is busier and more intimidating than any other limiter you've ever seen.

It's really five processors in series. The first stage is a slow compressor, followed by a conventional peak limiter. After that is something called a "HF Limiter", which is apparently a limiter with a HPF on the sidechain so that it only responds to high frequencies (> 11KHz). That feeds into a soft clipper. The final stage is a brickwall limiter that purports to address intersample peaks.

The whole design is clearly geared toward extreme volume maximization. I'd expect it to be popular among the EDM set (although those folks usually don't like so many knobs). For my own genre, which uses far more conservative limiting, I felt like it was more work than it was worth.

But if you had no other limiter, had no money to spend, and are the type who really takes the time to learn their tools well, then No. 6 might just be the ticket.

I'm liking Limiter No.6 more and more. I just finished a test with 6 songs were I used the Pro channel eq, Sonitus comp and Limiter No.6 to master. I don't have an audio editor so I created a new project and imported the wav files of each song (using tracks 1 through 6). I did my best with the Sonar meters to get a equal peak/ RMS level ( does anyone know of a better way to view the RMS levels?). I created a patch for the eq in pro channel and used the same one on each song ( each track), then inserted Sonitus and Limiter No. 6. I'm actually surprised with how well this worked. I used the Limiter No.6 to basically reduce gain by 1 db on all 5 of it's processors with the peaks set to zero. Nice loud, transparent, and level sounding group of 6. I can share detailed settings if anyone is interested.

Here's a few to check out:
http://code.mzuther.de/kmeter/
http://www.voxengo.com/product/span/
http://dynamicrange.de/es/es/download#menu1
http://www.toneboosters.com/tb-ebuloudness/

Voxengo SPAN

I have tried a lot of meters but this is the one I use day-to-day. It's not going to give you detailed amplitude statistics - I use Adobe Audition for in-depth analyses when necessary - but once you've established your own methodology, a simple K-meter is all you need.

If you want to compare all your songs at once (along with any reference recordings) with a single tool, Toscanalyzer is very cool.