
Description: Ninja is a small, fast build system designed for compiling code quickly. It focuses on speed and supports parallel execution for very fast builds using multiple CPU cores.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Bazel is an open-source build and test tool similar to Make, Maven, or Gradle. It is optimized for building large, multi-language software projects efficiently by incrementally building only what has changed.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API