Free SQLite

SQLite Home Page
Official site with downloads of latest versions, documentation, getting started, etc.

SQLite Database Browser
freeware, public domain, open source visual tool used to create, design and edit database files compatible with SQLite.

Categorical Index Of SQLite Documents
Comprehensive documentation with some legacy stuff.

PHP Manual Section on SQLite
Covers configuring, predefined constants, and the PHP SQLite functions.

SQLite Tutorial at tutorialspoint
Includes basic and advanced topics as well as interfaces with various languages, i.e., java, c++, php, perl and python.

Android SQLite database and content provider - tutorial
Using the Android SQLite Database

SQLite tutorial
This SQLite tutorial covers the SQLite database engine, sqlite3 command line tool and the SQL language covered by the database engine.