I have been using Debenu QuickPDF (now owned by Foxit) for many years. This is probably the most extensive PDF library available for Delphi.
Unfortunately it seems that FoxIt is no longer putting much resource behind this - they do not plan on bringing out a Delphi 11 version, even if it is just a recompile, and this doesn't bode well for long term support and development. While I will probably have to buy the source to use it with Delphi 11, it would be much better to have a supported advanced PDF library through TMS.
Maybe if they don't want it anymore...