SpiceDB is an open-source authorization tool inspired by Google's Zanzibar system. It allows developers to define schemas and relationships for access control, answering questions like "can subject X perform action Y on resource Z?" SpiceDB supports various datastores and can be self-hosted or used as a managed service.

Tanstack DB is in BETA and offers a reactive client store designed for building fast, sync-driven applications with a real-time data layer. It features a powerful query engine, fine-grained reactivity, and robust transaction support, along with opportunities for community involvement and partnership. Various tools under the TanStack umbrella, such as TanStack Query and TanStack Router, enhance the development experience.