Admin Tools and Core Replacements can be considered as admin-support-features.
Admin Tools are installed via the WB Backend:
Add-Ons -> Modules -> Install Module.
After the installation, you will find a new entry in admin-tools-menue.
Admin Tools modules can be used only in the backend of WB.
Core Replacements are not installed via WB Backend but via ftp.
Read installation advices at the threads.