The FormaVid Small Business Appliance https://formavid.org is designed to integrate a content management system (CMS), an issues tracker and an invoicing application into a single, well constructed, offering. It is an excellent starting point for any developer(s) wishing to support the CMS or any of the other components, including the appliance itself. All components are stable, open source and well supported. The appliance is built using scripts so no hidden "monkey business" and you can...
i-MSCP (internet Multi Server Control Panel) is an open-source project which allows the management of shared hosting environments on Linux servers.
i-MSCP aims to provide an easy-to-use Web interface for end-users (administrators, resellers and clients) and to manage servers without any manual intervention on the filesystem.
quickmail.php is a script that reads email from a mail server and outputs it in RSS format that can be displayed in a browser (as XML, using included XSL/CSS) or RSS aggregator or as WML for use on WAP devices (mobile phones/PDAs).
Unlimited organizations, 3 enterprise SSO connections, role-based access control, and pro MFA included. Dev and prod tenants out of the box.
Auth0's B2B Essentials plan gives you everything you need to ship secure multi-tenant apps. Unlimited orgs, enterprise SSO, RBAC, audit log streaming, and higher auth and API limits included. Add on M2M tokens, enterprise MFA, or additional SSO connections as you scale.
This is simple modular SMTP/POP3 Email server written in PHP. it uses a MYSQL database for user authentication. supports user alias and can handle multiple domains.