MySQL - The world's most popular open source database
PuTTY - Popular free terminal application. Mostly used as an SSH client.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
SQLite - SQLite Home Page
iTerm2 - A terminal emulator for macOS that does amazing things.