Available in different languages: English tr gl pl eo et nl nb pt_BR ru fr
As one big HTML file: English tr gl pl eo et nl nb pt_BR ru fr
As a PDF file. Bad encodings for many of the languages: English tr gl pl eo et nl nb pt_BR ru fr
Available versions of the user manual: 3.12 3.14 3.16 3.18 3.20 3.21