Grace

Free open-source Windows sampler aimed at people who build their own patches from raw samples.
Grace is a compact sampler for producers who make their own patches rather than buy libraries. Each voice gets two filters, AHDSR envelopes, LFOs and step sequencers, plus XY pads for control, and it imports SFZ patches alongside WAV, AIF and SND files. It is Windows-only and ships as a VST 2.4 plugin, with the source code released under the MIT License.
In action
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