Pine is a freeware, text-based email client which was developed at the University of Washington.

[3] Source code was available for only the Unix version under a license written by the University of Washington.

Pine is no longer under development, and has been replaced by the Alpine client, which is available under the Apache License.

Richard Stallman claims that the University of Washington threatened[10] to sue the Free Software Foundation for distributing the modified Pine program, resulting in the development of MANA ceasing and no versions being released.

[11] The Pico clone GNU nano was also written due to the change in licensing terms of Pine and Pico, as explained by nano's author in a blog post criticizing the license in 2001.