KivTools

A catalogue of developer utilities that run in the browser, sorted into JSON tools, files and media, format and convert, encoding and crypto, API and security, text and numbers, and network sections. The catalogue is searchable, which matters given how many individual tools it holds.

The API side is deeper than most browser toolboxes: an OpenAPI explorer, validator and test case generator, a Protobuf and gRPC inspector, an AsyncAPI validator, a CloudEvents validator with HTTP/JSON conversion, an API collection converter, a GraphQL explorer and an HTTP request builder. Elsewhere the list includes a CSS specificity calculator, a container query generator, a Markdown linter, a SemVer range tester, a Mermaid diagram studio, a Docker Compose validator, a Terraform plan JSON explorer, a PostgreSQL EXPLAIN analyzer and a SQLite database inspector.

Signing in is optional and does not gate the tools. Its stated purpose is a My Workspace area for organising frequently used tools and website links. The submitter describes the collection as local-first.