1. Alfresco

• Open source ECM platform
• 7.000.000+ users in 3.000+ companies from 180+ countries
• Based on Java
• Good mobile apps both for Android and iOS
• Unlimited customization capabilities

2. Activiti

• Open source BPM platform
• Enterprise level
• Based on Java
• Can be built in your own applications (distributed under the Apache V2 License)

3. Bizagi

• Proprietary BPM platform
• Free version with limit of 20 users (fits to automate processes in small organizations)
• Fast and simple development by using visual designer without programming
• Good integration capabilities (out-of-the-box connectors to SharePoint, Alfresco, Documentum, SAP)
• Extending by using your own .Net components for more complex tasks

4. Java (for back-end components)

• Rich stack of technologies for development all kinds of applications
• Huge community of developers
• Tools to develop enterprise level applications
• Open source, freeware
• For all hardware platforms

5. Web (for front-end components)

• HTML5
• JavaScript
• JQuery
• AngularJS
• Bootstrap
• REST