Trojitá
Trojitá () is a free software IMAP and SMTP email client developed using the Qt C++ library. The design goals of the maintainers are to develop a fast e-mail client which respects open standards, is cross-platform and uses the available resources very efficiently. Trojitá offers to manage contacts in the abook format, as introduced by the text-based user interface "abook addressbook program". In Autumn 2012, Trojitá became a part of the KDE community. History. In 2006, the project started as a private exercise in programming of Jan Kundrát. As a part of his studies, Trojitá became a  topic of the author's bachelor and master's theses, making a debut in 2009. In 2010, Jan was briefly contracted to work on Trojitá for a system integrator, but the project was cancelled for external reasons. After Jan's graduation, the governance of the project opened up and Trojitá moved beneath the KDE umbrella. As a part of the KDE community, Trojitá gained new contributors and was translated into thirty-three languages. Since 2012, Trojitá took part in two rounds each of Google Code-In as well as Google Summer of Code competitions. As of 2016, Trojitá includes  contributions from more than sixty developers. Trojitá is the e-mail engine used for mail synchronization within the xTuple's Postbooks ERP project. It was also planned to become the e-mail engine used in the Canonical's Ubuntu Touch mobile handsets until Canonical forked the code.