Opal Miner is a free Chrome add-on developed by rkat that allows you to export your Opal card data and view it in your calendar. This handy tool adds a "Download iCal" button to the Opal card activity page, alongside the existing "Download PDF" button. By clicking on the "Download iCal" button, you can generate a .ics file that can be imported into your preferred calendar application.

The latest update of Opal Miner now enables you to retrieve all of your Opal card history for the selected card. This means that you can easily keep track of your travel history and plan your future trips.

Opal Miner also provides an opportunity for users to contribute to its development. The source code is available on GitHub at github.com/rkat/opal_miner. Additionally, the add-on features an icon designed by Chris from kingdomofchris.com, adding a touch of visual appeal to your browser.