Welcome to my page of puzzle links! It will be expanded over time. Please note that these are meant as resources for further investigation, rather than specific recommendations. I haven't done every puzzle that you can find via this list (that would be a lot of puzzling!)
These websites are lists of other websites that regularly publish various kinds of puzzles. By "pen and paper puzzles", I mean puzzles that have traditionally been solved by writing on a grid printed on paper. However, many of these puzzles also have online solving options.
This list contains mostly American-style crosswords, with some other types such as cryptic crosswords and variety puzzles sprinkled in.
For anyone unfamiliar with these puzzle types:
A meta crossword listing presented in a calendar format. Meta crosswords contain a hidden word or phrase that can only be puzzled out after solving the crossword.
These bundles of crosswords can be "purchased" by making donations to charities associated with a cause that the bundle-makers want to promote. I left certain bundles that specify a single charity off the list, because I'm more prepared to vouch for general causes than for particular charities I don't know much about. I included a quote from each bundle's website describing where donations should be sent.