almozayaf: I was searching on GOG to see if they release any old classic recently but the only why I find is to look at the new releases one by one, is there a better way?
You can use mrkgnao's
magog search engine, it allows filtering by release date AND date of addition, among many other things.
EDIT: Hm, when I search for games older than 2005 that were added since the beginning of 2018, I only find Jill of the Jungle and Carmageddon TDR 2000. If you go back further, you'll find a bit more, and it seems like the most recent additions (last month or so) are not considered in the search yet, but it doesn't look like they added a lot of old games during the last year. JMich used to keep track of the amount of new games, older games and really old pre-2K games, but I think he stopped a year ago or so.