Mailvelope is a free software for end-to-end encryption of email traffic inside of a web browser (Firefox or Chromium) that integrates itself into existing webmail applications. Developed by Thomas Oberndörfer
License: Open Source
Mailvelope is a browser extension focused on providing encryption for webmail services, making it more user-friendly for casual users. In contrast, GPGMail is designed for Mac users, integrating deeply with Apple Mail but may require more technical knowledge to set up.