Three sample databases which are useful for testing things.
AdventureWorks for SQLite
git clone https://github.com/nuitsjp/AdventureWorks-for-SQLite
northwind.db
wget https://raw.githubusercontent.com/jpwhite3/northwind-SQLite3/master/dist/northwind.db
https://github.com/jpwhite3/northwind-SQLite3
chinook.db
wget https://raw.githubusercontent.com/lerocha/chinook-database/master/ChinookDatabase/DataSources/Chinook_Sqlite.sql -O chinook.db
https://github.com/lerocha/chinook-database