CM Updater also known as CyanogenMod Updater is an auto-updater for the CyanogenMod Android OS, the custom Android ROM. CM Updater has a theme support. The app requires ROOT access. It is an open source application developed under GNU GPL v2.
Tool Description as in http://www.freewarelovers.com/android/apps/cm-updater
ROM Manager is an excellent tool for rooted Android devices that allows the user to manage and run different ROMs by downloading and installing them directly from the SD card.
Tool Description as in https://rom-manager.en.uptodown.com/android
Image Credit: https://rom-manager.en.uptodown.com/android
ROM Installer, by JRummy Apps, is the best way to find and install custom ROMs and ZIPs. It is a must have app for any root user. You will find more ROMs available in ROM Installer than any other app on the Google Play Store. It has many of the same features that you will find in Goo Manager, ROM Manager, ZipInstaller, Flashify and other similar products.
Tool Description as in https://play.google.com/store/apps/details?id=com.jrummy.apps.rom.installer
Gapps Manager easy lets you download the proper gapps (google apps) flashable zip package to install on your custom ROMs. Currently, it supports gapps for gingerbread (2.3.x), ics (4.0.x), jellybean (4.1.x-4.3.x), and kitkat (4.4.x), art support also available.
Tool Description as in https://apkpure.com/gapps-manager/com.itslightness.gappsmanager
Flash your boot.img, recovery.img and zip files right away using Flashify. Be safe and backup everything either to local storage or cloud storage with automatic syncing. If you don’t know where to get your recovery files, just download directly from this app.
Tool Description as in https://play.google.com/store/apps/details?id=com.cgollner.flashify&hl=en
You can backup, restore, freeze (with Pro) your apps + data + Market links. This includes all protected apps & system apps, plus external data on your SD card. You can do 0-click batch & scheduled backups. Backups will operate without closing any apps (with Pro). You can move any app (or app data) to/from the SD card. You can browse any app’s data and even query the Market to see detailed information about the app.
Tool Description as in https://play.google.com/store/apps/details?id=com.keramidas.TitaniumBackup&hl=en
Source:Game of Roms