APSW stands for Another Python SQLite Wrapper.
APSW is a Python wrapper for the SQLite embedded relational database engine. In contrast to other wrappers such as pysqlite (which became the builtin sqlite3 module) it focuses on being a minimal layer over SQLite attempting just to translate the complete SQLite C API into Python. The documentation has a section on the differences between APSW and pysqlite. APSW supports CPython 2.3 onwards and CPython 3.1 onwards.
The latest documentation is at https://rogerbinns.github.io/apsw/
You can find existing and fixed bugs by clicking on Issues and using "New Issue" to report previously unknown issues.
The download documentation contains a list of binaries, source and further details including how to verify the downloads, and packages available for other operating systems.
See LICENSE - in essence any OSI approved open source license.