I nominate Synfig, which is a 2D vector animation tool. This is the most mature opensource tool in its category, but it still needs a lot of work to be able to

I nominate Synfig, which is a 2D vector animation tool. This is the most mature opensource tool in its category, but it still needs a lot of work to be able to compete with the commercial offering. https://www.synfig.org/ https://www.synfig.org/ https://www.synfig.org/donate/ https://www.synfig.org/donate/