5 Free Third-Party Rendering Engines for Blender 2.83+ | iRender
SheepIt is a free render farm for Blender animations - some powerful GPUs were added recently and there aren't many projects being rendered currently : r/blender
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SheepIt Render Farm
Render Automation On Blender - FREE — Blender.Today
Top 4 Cloud Render Farm Services for Blender: 2021 Comparison - Render Pool-Cloud-based GPU rendering