This site is specifically aimed to help with Pomeranian genealogy. However, I personally research in various other places and have (as of late) had difficulty finding the resources I’ve used previously because they’re not all in one place. Here’s a repository of some helpful links and websites I’ve found that have nothing to do with Pomerania but are helpful nonetheless.
Catholic Parish Registers at the NLI – digitized Irish church books
Irish Genealogy – indexed Irish civil records and church books
Placenames Database of Ireland – place mapping for Ireland
Ask About Ireland – Griffith’s Valuation
ScotlandsPeople – church, session, and presbytery records. Searchable indexed database
ScotlandsPlaces – tax rolls, maps, ordinance surveys, and other sources specific to each place