This Calibre plugin has been created to download metadata and cover image from Moly.hu.
Original post from https://www.mobileread.com/forums/showthread.php?t=193302 by Kloon: I must give credits to the original author, Daermond for making and publishing the initial plugin, but sadly he had abandoned it, so here I am taking over and fixing the errors that have popped up since.
Also, a big thumbs up for kiwidude, for sorting things out for me. And now an update by another author - fatsadt
Can retrieve title, author, series, ISBN, comments, tags, publisher, year of publication, rating and a cover images Shows multiple results if possible (3 by default) Search based on ISBN if present, otherwise based on title and/or author Downloads multiple cover images if possible (5 by default)
Requires Calibre 0.8 or later. Tested with 3.2.0.0
Download the attached zip file and install the plugin as described in the Introduction to plugins thread. Note that this is not a GUI plugin so it is not intended/cannot be added to context menus/toolbars etc.
Version 1.0.8 - 30 May 2018 Search primarily by isbn. (It's the most specific and accurate data. Try out the Extract ISBN plugin. With that the search is almost flawles) If no match found fall back to broader search. If no match try to remove () parts from title, after that try to remove authors. Update by Dezso
Version 1.0.7 - 8 May 2018 Find switched family-first names as well Update by otapi
Version 1.0.6 - 11 April 2018 The filter of relevant title and author by transliterate the extended Hungarian characters Update by otapi
Version 1.0.5 - 29 March 2018 Search was too wide, now filters only to relevant title and author Update by otapi
Version 1.0.4 - 25 Jan 2017 Now working again, and searches for ISBNs Update by fatsadt
Version 1.0.3 - 2 Jan 2014 Can download multiple bigger cover images now Reworked the plugin configuration
Version 1.0.2 - 28 Jul 2013 Patched plugin to work with the new layout of moly.hu Now parses language as well, so calibre will no longer capitalize Hungarian book titles
Version 1.0.1 - 9 Oct 2012 Fix for Moly.hu changes to html code Parses ISBN, publisher, year of publication as well Raised max number of results to 12
Version 1.0 - 08 May 2011 Initial release of plugin