On Friday, 2024-03-22, the german Federal Council (Bundesrat) passed the law on statutory domestic B2B e-invoicing which will ban paper and PDF invoices without Factur-X between german companies as of 2028. Background

We took this as an occasion to relaunch the (inofficial) https://ZUGFeRD.org/ page, which still lists open source tools but now also features a navigation and has a (english) FAQ you can contribute to.