Slightly more than three hours and then you can remove it.

ANNOUNCEMENT:
Version 6.6.2 has been released with the following features:

* Added a "Series ownership stasus" filter which allows one to filter games based on whether they belong to a fully owned, partly owned, or fully unowned series (according to the "My Tags" field) [inspired by plagren]
*** Note: Because of the special (two-stage) nature of this filter, it is applied before any other filter
* Added an "[Any]" option to the "Series name is..." filter, to allow one to list all the games that are part of some series

Why remove it so soon? The festive days last at least until Jan 6.

*checks mrkgnao's teeth size, keeps safe distance*

ANNOUNCEMENT:
Version 6.6.3 has been released with the following features:

* Added display of "Game ID" for sub-games of unbundled games (in the "Downloadable Files" row) [requested by adaliabooks]

ANNOUNCEMENT:
Version 6.6.4 has been released with the following features:

* Added a "Pack" button to the game display (below the "Forum" button), which yields (in a new window or tab) all the games belonging to the same pack as that game (if indeed it is part of a pack)
*** Note: A pack is a single game that is split into multiple catalogue items (usually standard edition +/- premium edition(s) +/- DLC(s)) (e.g. Age of Wonders 3)
* Added a "Pack name" filter which allows one to find all the games belonging to a given pack
* Added a "Pack ownership stasus" filter which allows one to filter games based on whether they belong to a fully owned, partly owned, or fully unowned pack (according to the "My Tags" field) [inspired by plagren]
*** Note: Because of the special (two-stage) nature of this filter, it is applied before any other filter (except the "Series ownership stasus" filter)

Assuming you meant "search for unowned DLCs for owned games", you can now, with the addition of the new "pack" feature above, do it.

Here is how:
1) Filter #1: Series/Pack... -> pack ownership status is... -> Partly owned
[finds all the packs that are partly owned (i.e. own at least one edition, but not all editions and DLCs)]
2) Filter #2: My Tags... -> is none of... -> owned
[leave only the unowned parts of each pack]
3) Scope: Clear All + check DLCs
[leave only DLCs]
4) Make sure that "Scope Algorithm" is "Greedy" (the default)
[make sure that DLCs that are also, for example, season packs are still listed]

Here are the results of this search for me (at the moment):
[url=http://www.an-ovel.com/cgi-bin/magog.cgi?ver=664&scp=d&dsp=ipgfsorlcmbah&ord=&flt=isp~p~3nn~owned%2C~&opt=&myf=SunDec270555482015_MuybBC93FPY3p]http://www.an-ovel.com/cgi-bin/magog.cgi?ver=664&scp=d&dsp=ipgfsorlcmbah&ord=&flt=isp~p~3nn~owned%2C~&opt=&myf=SunDec270555482015_MuybBC93FPY3p[/url]

Too late for the winter sale, but will be there for the next sale.

Hooray!

Now, is it possible for me to somehow have your babies?

Not yet, but I will add it to my todo list.

ANNOUNCEMENT:
Version 6.6.5 has been released with the following features:

* Added filtering by, sorting by and display of "Bestselling Rank" information (based on GOG's "by Bestselling" sort order, with #1 being the best)

ANNOUNCEMENT:
Version 18.0.2 has been released with the following features:

* Now Magog includes an online store. It's called Gog.

XD

Nice, thank you!

Has someone from GOG ever said what this Bestselling exactly means? Best selling games of all time, of last month, last week?

I've heard that it's supposed to be all-time bestselling based on overall USD revenue, not number of copies, which is why the free games are always at the end of the list. but I'm not sure whether this is official.

Front page best selling seems to be based on recent revenue, Catalog best selling seems to be by number of units sold in total. Anecdotal evidence, had done a quick check a few months back, no official word though.