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 primarily an open-source browser extension for encrypting emails through webmail services, focusing on user-friendliness and integration. In contrast, Lavabit offers a more comprehensive email service with a strong emphasis on privacy and security, providing end-to-end encryption and no data retention.