Off-the-Record Messaging (OTR) is a cryptographic protocol that provides encryption for instant messaging conversations.
Developed by Ian Goldberg and the OTR Development Team
Apps available for
Mac OS X
Windows
Linux
Java Mobile
Otr.to VS Off-the-Record Messaging
Off-the-Record Messaging offers robust encryption and is ideal for users seeking privacy across multiple platforms, while Otr.to provides a convenient web-based solution for anonymous messaging without installation.