swagger2openapi --> Node.js --> An OpenAPI / Swagger 2.0 to OpenAPI 3.0.x converter and validator https://openapi-converter.herokuapp.com
openapi-filter --> Node.js --> Filter internal components from OpenAPI 2.0 / 3.0.x definitions
baucis-openapi3 --> Node.js --> plugin for baucis.js
serverless-openapi-documentation --> Typescript --> Serverless 1.0 plugin to generate OpenAPI V3 documentation from serverless configuration
openapi-codegen --> Node.js --> Port of swagger-codegen templates, with OpenAPI 3.0 support https://mermade.github.io/openapi-codegen
openapi3-ts --> typescript --> TS Model & utils for OpenAPI 3.0.x contracts
oai-ts-core --> typescript --> Core typescript library to read and manipulate OpenAPI specification definitions