Project dossier

How does one move into part-time/consulting/etc?

Curious what people here have built for their own team or company that ended up making a real difference. It can be anything, whether it's a small CLI script, a browser extension, an internal dashboard, a Slack/Teams bot, or something bigger. What was the problem you were dealing with, what did you build, and did it actually stick around / get adopted by others on the team?