Dovecot is an IMAP server for Linux/UNIX-like systems, written with security primarily in mind. It also contains a small POP3 server. It supports mail in either of maildir or mbox formats. The SQL drivers and authentication plug-ins are in their subpackages.
Python 3.4 package for developers. This package exists to allow developers to test their code against an older version of Python. This is not a full Python stack and if you wish to run your applications with Python 3.4, see other distributions that support it, such as CentOS or RHEL with Software Collections.
Brotli is a generic-purpose lossless compression algorithm that compresses data using a combination of a modern variant of the LZ77 algorithm, Huffman coding and 2nd order context modeling, with a compression ratio comparable to the best currently available general-purpose compression methods. It is similar in speed with deflate but offers more dense compression.
Prosody is a flexible communications server for Jabber/XMPP written in Lua. It aims to be easy to use, and light on resources. For developers it aims to be easy to extend and give a flexible system on which to rapidly develop added functionality, or prototype new protocols.