It is required for you to install the SQLite runtime library when you're running the SQLite code. However, it is also useful (although not required) to install a SQLite interactive manager. You can download the precompiled binaries of SQLite tools from https://www.sqlite.org/download.html. However, version 3.11 or higher would be ideal.
Please note that if you're using Debian-derived Linux distribution, the libsqlite3-dev package should be installed.
It is also required for you to install and run the PostgreSQL Database Management System (DBMS) when you're running the PostgreSQL code. As with SQLite, it is useful but not required to install a PostgreSQL interactive manager. You can download the precompiled binary of PostgreSQL DBMS from https://www.postgresql.org/download/. However, version 7.4 or higher would be acceptable.
Installing and running the Redis server is necessary when you're running the Redis code. You can download it from https...