ERPNext covers most functionality required to run a small or medium sized business in Manfacturing, Retail, Distribution or Services including Financial Accounting, Inventory, CRM and Sales, Purchasing, Human Resource, Projects and a lot more.
Lacks available extensions or plugins, and extending functionality requires custom programming.
Management of content and data is relatively straight forward, but there may be a bit of a learning curve. Some programming experience may be required.
Has a smaller active community. Limited support is available either for free or as a paid service. Adequate documentation is available.