Proteus is described as 'combines a world-class business operating system with on-demand access to rated talent and pay-as-you-go access to major engineering software into a simple-to-use platform' and is an app in the Remote Work & Education category. There are more than 100 alternatives to Proteus for a variety of platforms, including Online / Web-based, Windows, Mac, Linux and Android. The best alternative is Odoo, which is both free and Open Source. Other great apps like Proteus are ERPNext (Free, Open Source), Dolibarr (Free, Open Source), Mautic (Freemium, Open Source) and EspoCRM (Freemium, Open Source).
Odoo (formerly OpenERP) is a suite of open-source business apps written in Python and distributed under the AGPL license, under the Open Core software business model. It is used by 2 million users worldwide to manage companies of all size.
ERPNext is a free and open-source integrated Enterprise Resource Planning (ERP) software developed by Frappé Technologies Pvt. Ltd. and is built on MariaDB database system using a Python based server-side framework.
Mautic is marketing automation software (email, social, & more). Install on your own website or create a free hosted account. The simple 3-step setup process takes less than 5 minutes and you'll be ready to reclaim control of your marketing.
SuiteCRM provides an enterprise-grade Customer Relationship Management (CRM) application to a global community of users and software developers. It is a robust and credible alternative to Salesforce, Microsoft and the major CRM vendors.