I created this stopwatch app to track what I did during the day. Before building this, I used timeanddate.com's stopwatch feature to track time using the split button and manually inputting task names. I would export the time data and put it into an Excel file, which was pretty boring.
Since ICS files can be imported directly into calendar apps, I wanted to build a stopwatch that could split time, let me input task names, and export everything as an ICS file. This way I could import it straight into Google Calendar and actually visualize what I did each day.
I still use this project most days and I'm really proud of it.