gif2webp: https://storage.googleapis.com/downloads.webmproject.org/releases/webp/index.html

Darwin libwebp-1.2.1-mac-10.15.tar.gz
Linux  libwebp-1.2.1-linux-x86-64.tar.gz
Windows libwebp-1.2.1-windows-x64.zip


rlottie + lottie2gif: https://github.com/Samsung/rlottie/tree/327fb7dbaad225555d5ca567b9adee9ce5f879f4

Darwin
Linux
Windows (built using ms-vscode + cmake)
