Some additional repos to consider:
saas-boilerplate v1.0.2 — A boilerplate for SaaS built with primarily Laravel, Bootstrap 4 and VueJs.
XpressInvoice — A SAAS based Invoicing App
oc-cumuluscore-plugin — OctoberCMS plugin helping developers with creating SaaS applications
govCMS-SaaS-vagrant — VM container for govCMS SaaS site factory using beetbox
Once a week...... I send out a list of most interesting PHP libraries and apps.
Want to get it?