If you know of any databases not listed here, please send the URL to be included. With thousands of new web pages being added on a daily basis, it is sometimes difficult to find the data for which you are searching.
All web pages linked here have data.
There's nothing quite like having a library online - especially if the library contains books that are helpful, sometimes even vital, for genealogical research. Online books often do not have search capacities, and are therefore not included in the searchable links below. These books, however, are too vital to ignore, and are included here. My favorite genealogical libraries also have a large collection of state, county, and town histories available for research, and links for those are also included here. Topics within each category further classify available data.