Aside from the fact that writing a book about Beancount is a positive contribution, the author maintains a list of Beancount resources[0] and has written several beancount plugins.[1, 2, 3, 4] I have personally benefited from his contributions to the Beancount ecosystem.

Can you point to some of your contributions to this project?

[0] https://github.com/siddhantgoel/awesome-beancount

[1] https://github.com/siddhantgoel/beancount-n26

[2] https://github.com/siddhantgoel/beancount-ing

[3] https://github.com/siddhantgoel/beancount-dkb

[4] https://github.com/siddhantgoel/beancount-commerzbank