There are a number of Firefly III tools and libraries you can check out and use, which are made by me.
Community contributions can be found on the third-party tools page.
The Firefly III product manager is a tool that you can use to manage costs over time, for example for your car or for your appliances.
The Firefly III auto-save tool is a tool that you can use to automatically create new "top up"-transactions that round your expenses up to the nearest Euro.
API support classes
A small package with code to use the Firefly III API. Is used in the data import tools.
Recovery code thing
A small change to a recovery code package so it's compatible with PHP 8.0.
2FA laravel code things
Some changes to a 2FA package so it can handle 2FA authentication over sessions.