This free bundle is just insanely great. What MeldaProduction is giving away for free is hundreds of dollars worth of processing.
The compressor alone is a fantastic tool, it is the one that taught me the most about how to set up a compressor to do what I want it to.
The analyzers are essential tools in my studio as is the equalizer.
I don't use all of them, but some of them I use on every single project I create.
With the $50 registration, you get among other things, upsampling, which is a worthwhile feature. Also, it helps out the developer, who is doing the recording world a great favor by putting these out for free.
The pitch corrector, for heaven's sake, is great to have, and it will do the Cher/T-Pain as well as more subtle correction.
They are all so feature rich that I have used some of them for years without realizing their full potential.
I agree with the previous comments, Melda also has regular sales with 50% off. It's worth upgrading to gain access to the batch processing feature on MLoudnessAnalyzer, it makes it possible to set offline files to a specific loudness. MNotepad and Msaturator are also quite useful.