DirtyPumper

Dirty Pumper is pretty fun to play with. It works good on Hammond giving it soft overdrive sound without adding too much highs. I don't think it will be good on guitar, but on organs it does the good work. On DX7 it is good as well. On drums, I assume will do the job well, but haven't tested it there. Its not actually pumper, since there is no LFO tremolo.

Plugin has two knobs for IN, OUT gain - this is good and quite unusual in world of free plugins.

GUI is too big and lowpass filter is not doing much, I would make it bit stronger.

Worth downloading.