Liquid Prompt
A full-featured & carefully designed adaptive prompt for Bash & Zsh
... with the AGPL clauses, anybody offering Liquid Prompt over the network is required to also offer access to the source code of it and allow further use and modifications. As Liquid Prompt is implemented purely in shell script, anybody using it over SSH or equivalent terminal connection automatically also has access to the source code, so it is easy to comply with the license.