I started using Affinity products. As far as I know hey do not support animations yet though so it's not an alternative to After Effects. Though a great alternative to Illustrator/Photoshop/Indesign.

For video editing I use Lightworks (Works on all platforms, I think also open source) and that is just amazing piece of software.

for animations like these ... I didn;t look into it yet but I'm planning in very near future, even if just for making some nice User Flows.