A developer is building a modern open-source animation tool designed as a spiritual successor to Adobe Flash, targeting 2026 compatibility with Linux, Mac, and PC. The project, developed in C# with Avalonia and SkiaSharp, aims to recreate Flash's full authoring environment including timeline, drawing tools, symbol library, tweening, and scripting capabilities.

This isn't a proof of concept but a comprehensive 2D animation authoring environment. The developer has implemented a vector engine using DCEL data structures that replicates Flash's merge drawing mode and supports all five original paint modes. The timeline features keyframes, frame-by-frame animation, and onion skinning, while the symbol library includes graphic symbols, movie clips, and button symbols.

The project's most impressive feature is .fla file import capability - reportedly the only open-source tool that can both import and edit Adobe Flash files, not just play them back. The developer is building a dual-surface scripting system using Roslyn for both authoring-time and runtime scripts, with plans for an ActionScript-to-C# transpiler. A Patreon has been launched to support development and potentially build a dedicated team.