The best open source alternative to Arc Studio Pro is Story Architect (STARC). If that doesn't suit you, our users have ranked more than 10 alternatives to Arc Studio Pro and three of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Arc Studio Pro are Trelby and (Beat).
A smooth yet powerful writing experience for devoted authors. With only wanted features and native workflow it runs faster than all your previous apps combined.
Trelby is simple, fast and elegantly laid out to make screenwriting simple. It is infinitely configurable.
Beat is an elegant screenwriting app for macOS and iOS, created by a screenwriter for screenwriters. And best of all — Beat is fully open source!
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