For some time after 1983, Poplog was sold and supported internationally as a commercial product, by Systems Designers Ltd, whose name changed as ownership changed. (The company is now owned by EDS) In 1989, it was called SD-Scicon. 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 most of the software development while it was a commercial product.
ISL and its clients used Poplog for a number of development projects, especially their data-mining system Clementine, mostly implemented in POP-11, using powerful graphical tools implemented also in POP-11 running on the X Window system. Clementine was so successful that in 1998 ISL was bought by SPSS Inc who had been selling the statistics and data-mining package SPSS for which they needed a better graphical interface suited to expert and non-expert users. SPSS did not wish to sell and support Poplog as such, so Poplog then became available as a free open source system, hosted at the University of Birmingham, which had also been involved in development after 1991.
Poplog has been used both for academic research and teaching in Artificial Intelligence and also to develop several commercial products, apart from Clementine. A UK government SMART award was given to ISL in recognition of Poplog exceeding sales of 5 million dollars.
There is a version for Windows, originally developed to support Clementine, but the Unix/Linux graphical subsystem does not work on Windows Poplog. However, the linux version of Poplog runs successfully under VMware on Windows. The Windows version of Clementine depended on a commercial package that supported X window functionality on Windows.
Additional information about the history and features of Poplog can be found in the entries for POP-2 and POP-11. The chief architect of Poplog, responsible for many innovations related to making an incrementally compiled system portable, and providing support for a collection of very different languages was John Gibson, at Sussex University, though the earliest work was done by Steve Hardy. Chris Mellish helped with the initial Prolog implementation in POP-11. John Williams, working under supervision of Jonathan Cunningham implemented the Common Lisp subsystem. Robert Duncan and Simon Nichols added Standard ML. 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. Since 1999 he has been responsible for the main Poplog web site, as well as some of the extensions to be found there, listed under POP-11.