AlliGater (freeware): A very powerful gater that introduces some new and unheard features to influence your sound way beyond Off-On-Off-On. Especially the powerful MIDI implementation offers many interesting possibilities!
AlliGater Pro (shareware): This is the extended version. It offers a much wider range of tempo synchronisation options, syncs playback to the start of the host and has extended value ranges for the "time" knobs. It also has 16 presets instead of 1 and, most important, you can not only gate the volume, but may also route the gate envelope to panning and cutoff or resonance of an internal filter!
cairo is a tempo synchronized gate effect. choose a gate speed, and modify the envelope to cut up your audio into different sized slices, with soft or smooth edges. a biquad filter, soft distortion, and overall mix round out the effect. version 1.1 adds the randomizer and improved UI control over the speed setting.
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Gatecomb is a stereo comb filter. The frequency of the comb filter is controlled by an AHDSR envelope which is either triggered in sync with the sequencer or by the the incoming audio reaching a certain threshold. There is also a filter to control the sounds (which can sometimes be very brutal). When processing a stereo track, the right fiter can be offset by octaves or semitones.
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Skidder turns your sound on and off. While that may not sound very rewarding, you have a great deal of control over the rate, pulsewidth, on/off slope, panning width, etc. You can also relinquish some control to randomization. Skidder can also sync with your song tempo and can be triggered by MIDI notes.
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