Jet Admin - Build business apps really fast
Sketch Repo - Collection of resources for anyone who uses Sketch
Retool - Build custom internal tools in minutes.
Anima App - Design, get feedback, convert to code, publish, iterate.
Appsmith - Appsmith is an open source web framework for building internal tools, admin panels, dashboards, and workflows.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.