After an incremental compiler for Prolog had been added to an implementation of POP-11, the name POPLOG was adopted, to reflect that the expanded system supported programming in both languages.
The name was retained, as a trade mark of the University of Sussex, when the system was later (mid 1980s) extended with incremental compilers for Common Lisp and Standard ML based on a set of tools for implementing new languages in the Poplog Virtual Machine.
At that time a management buy-out produced a spin-off company Integral Solutions Ltd (ISL), to sell and support Poplog in collaboration with Sussex University, who retained the rights to the name 'Poplog' and were responsible for the core software development while it was a commercial product.
There is also an open source project[7] which aimed to produce a more platform neutral version of Poplog, including Windows.
A more narrowly focused open source Poplog project, restricted to the 64-bit AMD64/X86-64 architecture was set up on GitHub by Waldek Hebisch: [1].
The chief architect of Poplog, responsible for many innovations related to making an incrementally compiled system portable, and providing support for a collection of languages was John Gibson, at Sussex University, though the earliest work was done by Steve Hardy.
Between about 1980 and 1991, the project was managed by Aaron Sloman, until he went to the University of Birmingham, though he continued to collaborate with Sussex and ISL on Poplog development after that.
The implementation was constrained by the need to allow data-structures to be shared with the other Poplog languages, especially POP-11 and Common Lisp, thereby providing support for a mixture of programming styles.