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 encryption tool designed to secure email communications through PGP, ideal for users who are comfortable with managing encryption keys. In contrast, Kolab Now is a comprehensive email service that combines encryption with collaborative features, making it more suitable for teams and organizations looking for productivity solutions.