Apps similar to Autumn include WHMDC. It's paid, but Paymenter and FOSSBilling are free. Other options are WHMCS, BILLmanager, BoxBilling and FluxBilling. You can choose from more than 10 Billing Systems like Autumn for the web, self-hosting, Linux, Windows and Mac.
Whasols Simplify and automate daily tasks and operations with the best choice in Web Hosting Automation by the world's best organizations, for 4 years and running, it has been delivering smiles to hundreds of IT advisors, developers, users, and business owners.
MythicalDash is an open-source, user-friendly client area for managing servers on platforms like Pterodactyl and Plesk. It simplifies server management with a secure and feature-rich interface.
Romania
EU
BillingServ provides hosting companies & small businesses with a software as a server billing system designed to increase ease of billing, cut costs and increase stability as BillingServ is hosted in the cloud.
Web Hosting Manager with hosting control panel on a modern from-scratch stack — FrankenPHP, MariaDB, Stalwart Mail, SFTPGo, Knot DNS. Plain PHP + Tailwind, one-command installer for AlmaLinux, multi-PHP-version support, AutoSSL, reseller accounts. MIT licensed.
United Arab Emirates
Sivver is a complete ERP-solution for ISPs / hosting-providers, online- and local businesses. The software provides automation for relevant business-processes which includes product management / provisioning, billing, support and more.
Automated billing and customer management platform for IPTV providers with panel integration, multi-gateway payments,and white-label storefronts.
NetherlandsEU
United Kingdom
