Free open source alternative app list of Postman :

Visual Studio Code

Code editing. Redefined. Free. Built on open source. Runs everywhere. Visual Studio Code is a code editor redefined and optimized for building and debugging modern web and cloud applications. Visual Studio Code is free and available on your favorite platform - Linux, macOS, and Windows.

FreeWindowsmacOSLinux

Bruno

Bruno is a Git-integrated, fully offline, and open-source API client. Developer First Open-source community and extensibility are our cornerstones. We're proud to be an API-client and commit to not bloating our product with unnecessary 'platform' features. Native Git Integration Collaboration requires context and a shared location. Collections can live directly in your Git provider so they're always versioned. Offline only We take security and privacy seriously. Bruno is an offline tool and there is no syncing of your data to any cloud.

FreeWindowsmacOSLinux

API Dash

Test, Visualize & Integrate APIs in a Dash ⚡️ API Dash is a beautiful open-source cross-platform API Client that can help you easily create & customize your API requests, visually inspect responses ( full list of supported mime-types ) and generate API integration code ( full list ) on the go.

FreeWindowsmacOSLinux

Playwright

Playwright enables reliable end-to-end testing for modern web apps.

FreeWindowsmacOSLinuxAndroidiOS

Yaak

The API client for modern developers A fast, offline, and Git friendly app for HTTP, GraphQL, WebSockets, SSE, and gRPC. Fast and private Local-only data, secrets encryption, and zero telemetry. Filesystem friendly Optionally store data as plain-text for use with Git. Extensible NodeJS plugin system for auth, template functions, and more.

FreemiumWindowsmacOSLinux

Lapce

Lapce (IPA: /læps/) is written in pure Rust, with a UI in Floem . It is designed with Rope Science from the Xi-Editor , enabling lightning-fast computation, and leverages wgpu for rendering. More information about the features of Lapce can be found on the main website and user documentation can be found on GitBook . Features Built-in LSP ( Language Server Protocol ) support to give you intelligent code features such as: completion, diagnostics and code actions Modal editing support as first class citizen (Vim-like, and toggleable) Built-in remote development support inspired by VSCode Remote Development . Enjoy the benefits of a "local" experience, and seamlessly gain the full power of a remote system. We also have Lapdev which can help manage your remote dev environments. Plugins can be written in programming languages that can compile to the WASI format (C, Rust, AssemblyScript ) Built-in terminal, so you can execute commands in your workspace, without leaving Lapce. Installation You can find pre-built releases for Windows, Linux and macOS here , or installing with a package manager . If you'd like to compile from source, you can find the guide . Feedback & Contact The most popular place for Lapce developers and users is on the Discord server . Or, join the discussion on Reddit where we are just getting started. There is also a Matrix Space , which is linked to the content from the Discord server. License Lapce is released under the Apache License Version 2, which is an open source license. You may contribute to this project, or use the code as you please as long as you adhere to its conditions. You can find a copy of the license text here: LICENSE .

FreeWindowsmacOSLinux

Apidog

Apidog An integrated platform for API design, debugging, development, mock, and testing.

WindowsmacOSLinux

Apifox

Apifox = Postman + Swagger + Mock + JMeter It integrates interface documentation tools, interface Mock tools, interface automated testing tools, interface debugging tools, and improves the R&D efficiency by 10 times. It is the best API document tool, API automated testing tool, API Mock tool, interface document management tool, interface document generation tool.

FreemiumWindowsmacOSLinux

Others are looking for free open source alternatives of following apps:

Acorn 7

Acorn 7 is a Mac image editor for editing photos and creating graphics.

Ad Blocker

Ad Blocker is a browser tool that removes intrusive ads and pop-ups from web pages.

AI & Machine Learning

Free open-source AI & machine learning tools.

AdGuard

AdGuard is a cross-platform ad blocker that filters web content and protects privacy.

AdGuard DNS

AdGuard DNS is a DNS-based service that blocks ads, trackers, and malicious websites.

Adobe Premiere Pro

Adobe Premiere Pro is a professional video editing software for film, TV, and web.