Derek Stewart has made eBooks of the main four manuals and programming documents for Prowess and Proforma.
Download them in .epub, .mobi, .pdf and .azw3 formats for your favourite eBook reader from http://www.dilwyn.me.uk/docs/ebooks/index.html If anyone has any more Prowess apps not yet preserved on my site, or more recent versions than already on there, please send them to me to add. Best way is to email them as zipped attachments. Prowess page is at http://www.dilwyn.me.uk/prowess/index.html