You can also look up for these other topics:
Framework
Coding Standards
Boilerplate
CMS
Tool
Security
Hacktoberfest
Free and open-source web application for MSPs that streamlines IT documentation, ticketing, invoicing, and accounting, an alternative to ITGlue. It helps in managing and organizing client's IT informa
itflow-orgAn Open Sourced Invoice System developed for anyone who needs to generate out an invoice and manage clients
poowfOpen source inventory management system with php and mysql Invoice generation and easy to download invoice in PDF format Lightweight and easy to use Order management and product management can be done
stemword