For hobbyists, Lordicon and IconScout offer free tiers where you can download packs of animated UI icons. How to Download and Extract Your Items
Platforms like Envato Elements or Motion Array provide professional-grade animated lower thirds and icons in compressed formats. Download Animated Items zip
LottieFiles is the industry standard for scalable, code-based animations. You can often download curated collections as a ZIP. For hobbyists, Lordicon and IconScout offer free tiers