VIENNA Advantage is described as 'Open Source ERP and CRM with HTML5 UI. Use it on the cloud or download code! Powerful DMS and POS module available on demand to boost your business' and is a CRM system in the business & commerce category. There are more than 50 alternatives to VIENNA Advantage for a variety of platforms, including Windows, Online / Web-based, Linux, Mac and Android. The best alternative is ERPNext, which is both free and Open Source. Other great apps like VIENNA Advantage are Odoo, Dolibarr, OrangeHRM and inoERP.
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.
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.
Free and open source human resource management software (HRMS / HRIS) with rich features and easy to use interface. It covers personnel information management, employee self service, leave, time & attendance, benefits, and recruitment.
Tryton is a three-tiers high-level general purpose application platform under the license GPL-3 written in Python and uses PostgreSQL as database engine. It's the core base of a business solution providing modularity, scalability and security.
webERP is a complete web based accounting/ERP system that requires only a web-browser and pdf reader to use. It has a wide range of features suitable for many businesses particularly distributed businesses in wholesale and distribution.