Twilio has officially open-sourced its OpenAPI specification for every Twilio API as a commitment to supporting and streamlining the development process for its users. This empowers developers to effortlessly integrate Twilio into their projects, regardless of their preferred language or tools. With the OpenAPI Specification, developers can generate new client libraries using the power of the Twilio OpenAPI generator, making it more convenient to use Twilio in their preferred programming language without writing complex methods and functions. Additionally, this specification allows for mock testing of Twilio's API locally, making test suite integration with Twilio faster and less brittle. Furthermore, support has been added for Postman, a free development tool for making API calls, allowing users to browse the Twilio Postman APIs visually using Postman.