Drumatic 3

Excellent! One of the best free drum kits I've heard.

Superbe sound.

Totally subtractive synthesis (it doesn't use any sample).

All what you could need to tweak each element of the kit. Knobs, harmonic modifiers (and graphically!), management of the characteristics of the noise oscillators, etc.

Multi-Segment-Graphical-Envelopes (MSGE) for each element of the kit with many options for each envelope.

A stereo output for each element of the kit.

A section of effects.

It can to be used to emulate a true drum kit as well as a drum-machine.

It NEVER crashes.

It is not at all real "donationware" since there are absolutely not any limitation. It is in fact totally freeware! The donation is just suggested but not imposed by any limitation.

And there are extra patches available here at the Download tab above (direct link here) but also still other patches at Patcharena here.

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And for those who would be allergic to SynthEdit, it is good to know that there is now a new version (version 4) which is no longer made with SynthEdit, which uses ses a mix of subtractive, FM and wavetable synthesis, which provides still much more different sounds... which works on Windows 64-bit native and on OS X! But that version 4 is not free, its price is €30. A bargain.