Vitess

PlanetScale is a managed cloud database platform for Vitess/MySQL, Neki sharded Postgres, and PostgreSQL. Vitess and Neki support horizontal scaling through sharding, while the platform provides connection pooling, read replicas, online schema changes, branch-per-environment workflows, automated backups, failover, and online cluster resizing and resharding. Its database workflow includes schema branches, deploy requests, revertable changes, and Database Traffic Control, which enforces query-traffic budgets to limit runaway queries and unexpected load spikes. PlanetScale exposes these capabilities through its platform tooling, APIs, CLI, and an MCP server for controlled agent-operated database changes. The service offers hosted deployments and a bring-your-own-cloud option through PlanetScale Managed, with deployments on AWS and GCP. The homepage states that multi-region deployments have a 99.999% SLA commitment and single-region deployments have a 99.99% commitment.

Neki is PlanetScale's sharded PostgreSQL product, built by the team behind Vitess. It uses explicit sharding to distribute PostgreSQL data and queries across multiple servers for demanding workloads. Neki is not a Vitess fork; PlanetScale says it was designed from first principles for PostgreSQL and was developed with large-scale design partners. The product was announced as available in Platform Preview.

MariaDB Server is an open-source relational database developed by a global community with the MariaDB Foundation and MariaDB plc. It began as a fork of MySQL led by members of the original MySQL team and maintains substantial MySQL wire-protocol and syntax compatibility, making it a database backend for applications such as the Magic application builder. The server supports pluggable storage engines including InnoDB, Aria, MyRocks, ColumnStore, Spider, and S3; asynchronous, semi-synchronous, and parallel replication; and Galera synchronous multi-primary clustering. Its SQL features include vector search with a built-in VECTOR type and HNSW indexing, common table expressions, window functions, temporal tables, sequences, JSON functions, GIS, full-text search, role-based access control, pluggable authentication, encryption at rest, and TLS connections. It is licensed under version 2 of the GNU General Public License.

Vaultisse is an open-source web application for managing physical book collections at home, in schools, or in small lending libraries. It catalogs books by manual entry or ISBN scanning, automatically retrieving metadata through Google Books, Open Library, and LibraryThing fallback lookups, and tracks individual copies, their shelf or location, reading and availability status, damage, and current borrowers. It also provides full-text search, barcode and ISBN label printing, collection statistics, and organization by author, category, language, and format. The application uses a Vue 3 and Vuetify single-page frontend with an Express and TypeScript REST API backed by PostgreSQL. It supports JWT sessions in HTTP-only cookies, password hashing, optional OIDC/SSO, rate limiting, and a multilingual interface. Vaultisse can be run locally or deployed with Docker or PM2; its source code is licensed under the MIT License.

Vitest is a Vite-native testing framework for deterministic unit tests and evaluation checks. It reuses Vite configuration, plugins, module resolution, and transformation pipelines, while also working without Vite and supporting backend code. Vitest is Jest-compatible, with support for assertions, snapshots, coverage, ESM, TypeScript, and JSX, plus a watch mode that reruns tests related to changed files. It is free and open source.