It can be seen as the latest iteration of the original PCSX codebase. In 2019 another fork PCSX-Redux was started.
PCSX-df and PCSX-Reloaded coexisted for a while, with PCSX-df merging changes of PCSX-Reloaded back into df. PCSX-Reloaded is a new project created in mid-2009, which is based on the work of the PCSX-df branch, completely independent, and works on bug fixes while maintaining Windows and OS X compatibility alongside Linux.
Version 1.10 was released on March 29, 2009. PCSX-df was created in 2006 and added new features, a new GTK-based interface, AMD64 support, and corrected some bugs, but was developed mainly with only Linux compatibility in mind. Official development ceased on September 17, 2003, and development shifted to the new PlayStation 2 emulator, PCSX2. The emulator was first released for the PC on August 31, 2000.