Marimka is a virtual instrument on the line of HarpTime and Peti, that is targeted to ethnic folk sounds, in this case marimba and balafon, tuned percussions. It is able also of other percussive sounds like frame drums.
Marimka is anyway not merely an acoustic emulation, at extreme settings it reveals a strong synthetic timbre, so it’s very nice also for hybrid textures. Despite the few controls you see on the GUI the range of different percussive sounds is huge.
Marimka is pure shareware, it’s freely downloadable as trial, but if you use it in your music you have to buy a license for 19 USD.