ScriptPlayer+

Free, source available under PolyForm Noncommercial
Visit Project → Source Code → Platforms: Windows, macOS

Portable funscript player built around a folder-first workflow rather than a managed library, with automatic script and subtitle matching and support for audio-only content. Buttplug support ships as a separate experimental build; the author notes they own no compatible hardware, so it is unverified on real devices and feedback from Intiface users is wanted.