I will make a longer description available soon, this is just a draft, but I guess that people, who need this tool, will know what to do with it anyway.

SubExpress allows you to instantly create subdomains on accounts with cPanel. It's a desktop application, no installation required.

The main features:

• create subdomains in bulk
• verify that your subdomains exist
• delete subdomains in bulk
• save your lists of subdomains for future use
• works on any account with cPanel - no need for Web Host Manager (WHM)

You can download it here.