What are some alternatives?
When comparing OpenToonz and Adobe Animate, you can also consider the following products
Synfig Studio - Just another WordPress site
Pencil2D - Pencil2D is an opensource animation/drawing software for Mac OS X, Windows, and Linux, based on old...
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
TVPaint Animation - TVP Animation is the leading paperless drawing and animation tool, able to imitate traditional 2D animation.
Adobe Fireworks - Adobe Fireworks is a bitmap and vector graphics editor.
Toon Boom Harmony - Production-ready animation software for every artist, in any style.