SQLite's author, D. Richard Hipp, provides professional support and consulting for SQLite. More information can be found at

The SQLite web site is an invaluable source of information, including the complete documentation to SQLite's SQL C API, as well as its associated subsystems such as the VDBE:

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Information related to third-party software, such as drivers and extensions, along with other miscellaneous information is available on the SQLite Wiki: