Yes, Namecheap offers a cPanel Website Builder plugin. You can find more information about it here
We also offer Managed WordPress Hosting solution EasyWP and Weebly website builder, both available from our marketplace.
In addition, you can make use of the scripts available in Softaculous, the installer included into cPanel. It helps to install some of the most useful software that can be used on shared hosting servers. Softaculous is a great auto-installer with more than 200 great scripts, and they are still adding more. You can see a complete list here.
You may also edit the pages on your site from within the File Manager in your cPanel. You will find the following options at the top of the File Manager screen: Edit and HTML Editor.
Edit: will open a code editor for the selected file
HTML Editor: will open an editor specially designed for HTML files only