here they are:
i have saved all the links in an excel file to facilitate sharing, albeit access as a database application works just as well and i use that, too.
there are different tabs to separate the links according to their main purpose or location -- the ones derek added to the first post are in the uefa tab, and i’ll pick some to illustrate what the titles and comments mean.
match results: self-explanatory -- can be very helpful when lower leagues are covered to find out the name of the club/league/division. often includes logos.
database: very helpful when you want to look up historic names of clubs/leagues, find out if and with who they have merged or have been absorbed and so forth.
logo database: the category that interests logo hunters most. sometimes a site that i classified as match results or (general) database has a huge number of logos in good size, but then i chose the category after its main purpose (coverage of competitions or presentation of graphics).
active: in hindsight, i should have written online. there are sites that are still online, but no longer updated or maintained. in any case, here is my first tip
when you have a defunct web site, you can still access it through web archive/wayback machine, have a look:
great football (ukrainian site) - offline
go to web archive/wayback machine, copy the url into the search mask and then pick a snapshot of the site. here is one to show you an example:
great football accessed through wayback machine
another helpful browser add-on is svg gobbler. many club or federation web sites have svg files and with that add-on you can sometimes find them easier:
svg gobbler
final note: recommended means basically that the site is so good that you should have a look there first (in cases where there are several sites covering the same topic).