The Git plugin was primarily being used to provide version information that Boot's maven plugin can add into the MANIFEST.MF of the uber-jars that it creates under the Spring-Boot-Commit-Id attribute. This commit removes the Git plugin from Boot's own projects, but leaves it in the spring-boot-starter-parent for use by Spring Boot-based applications. The attribute in the uber-jars' MANIFEST.MF has been replaced with a Spring-Boot-Version attribute. The value of this attribute is the implementation version of Repackager class's package.
Spring Boot - Tools
Spring Boot Tools provides a logical grouping for our various build system plugins, and the modules that support them. We provide a spring-boot-maven-plugin and spring-boot-gradle-plugin for Maven and Gradle respectively.
If you are interested in how we support executable archives, take a look at the spring-boot-loader module. If you need to create executable archives from a different build system, spring-boot-loader-tools may help.