https://www.blender.org/
is one of the FaceRig alternatives that allow you to convert your still avatar into animations that are impressive. This free FaceRig alternative is an open-source 3D creation suite where you can do anything from modeling to rigging, simulation to animation, compositing, rendering, and motion tracking as well. Along with that, you can also edit your video and create a game. It is a cross-platform that works well with Mac, Windows, and Linux. This Alternative to FaceRig has a long list of tools to offer you that you can make your 3D character unique. Blender