UebiMiau is a webmail reader application supporting both IMAP and POP3 protocols. It can be installed without dependence of any PHP's extra modules or a separate database. It is Open source software

Open-source software

Open-source software is computer software that is available in source code form: the source code and certain other rights normally reserved for copyright holders are provided under a software license that permits users to study, change, improve and at times also to distribute the software.Open...

 published under GNU

GNU

GNU is a Unix-like computer operating system developed by the GNU project, ultimately aiming to be a "complete Unix-compatible software system"...

 General Public License

GNU General Public License

The GNU General Public License is the most widely used free software license, originally written by Richard Stallman for the GNU Project....

 (GPL).

UebiMiau has not been developed since March 2006 and does not work with PHP

PHP

PHP is a general-purpose server-side scripting language originally designed for web development to produce dynamic web pages. For this purpose, PHP code is embedded into the HTML source document and interpreted by a web server with a PHP processor module, which generates the web page document...

5.3 due to its use of deprecated functions. A new project, which is a forked reboot of UebiMiau based on the jimjag patches, named Telaen is an actively developed drop-in replacement.