LottieLab is described as 'Create and edit Lottie animations'. There are four alternatives to LottieLab, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, Apple Swift, Windows and React. The best alternative is Lottie, which is both free and Open Source. Other great sites and apps similar to LottieLab are Animator (Paid), Keyframes (Free, Open Source) and Squall (Paid).
Animator by Haiku is a creative environment for crafting codebase-ready animations. Carefully built around modern workflows, Animator integrates with your favorite design and code tools, and it's all backed by git version