Binary descriptions:

android-platform-tools-base: base tools for developing applications for the Android system
libandroid-ddms-java: Communicate with devices through adb - Core library
libandroid-layoutlib-api-java: Library to use the rendering library for Android layouts - API
libandroid-tools-annotations-java: annotations used throughout the Android tools libraries
libandroid-tools-common-java: common library used by other Android tools libraries
libandroid-tools-dvlib-java: Library to manage the Android device database XML files
libandroid-tools-repository-java: Library for downloading and managing package repositories
libandroid-tools-sdklib-java: Library to parse and download the Android SDK
libgradle-android-plugin-java: Android Plugin for Gradle
libgradle-android-plugin-java-doc: Android Plugin for Gradle - Documentations