Bazel is described as 'Open-source build and test tool similar to Make, Maven, and Gradle. It uses a human-readable, high-level build language. Bazel supports projects in multiple languages and builds outputs for multiple platforms' and is a Build System in the development category. There are more than 25 alternatives to Bazel for a variety of platforms, including Linux, Windows, Mac, BSD and Android apps. The best Bazel alternative is CMake, which is both free and Open Source. Other great apps like Bazel are GNU Make, Maven, Gradle and Ant.