Une caisse en ligne auto hebergeable en php/symfony/js/angular
Sources sur https://framagit.org/tykayn/caisse-bliss/

En:
Self hosted mobile and desktop Cash register and money management for your small business. Made after years of experience in the art of selling home made books and drawings during events like Japan Expo.

Features:

live selling and stock update on phone and desktop
multi user registration
managing products, categories
forecast of expenses
events
statistics about earnings
history of client purchases
import and export your products and selling history
have a look at where your expenses go during selling events
all in a libre software in PHP/JS