What are some alternatives?
When comparing MacTerm and Firebug, you can also consider the following products
PuTTY - Popular free terminal application. Mostly used as an SSH client.
Postman Collections - Biggest library of ready-made API collections for Postman
ConEmu - ConEmu-Maximus5 is a full-featured local terminal for Windows devs, admins and users. Get better console window with tabs, splits, Quake style, copy+paste, DosBox and PuTTY integration, and much more.
Grunt - The Grunt ecosystem is huge and it's growing every day.
OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.