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Opinio is a free and comprehensive system to create, publish, analyze and maintain surveys. Ease of use and simple installation makes it suitable to any organisation. With Java/JSP/Servlets at its base, it is a platform independent (Windows, Linux, etc), robust and scalable survey system. This software is designed with an open database platform and supports all major databases (Oracle, Mysql, SQL Server, etc). Major features include: 1) Flexible survey design. 2) Advanced reporting. 3) Plugin architecture. 4) Multilanguage support. 5) High scalability. 6) Simple installation. 7) Web based administration. 8) Conditional branching & skip patterns. 9) Invitation handling. 10) Import/export. 11) Piping 12) Report portals 13) Panel management 14) ...and much more. In addition to regular surveys, Opinio can provide the technology for essay tests, user registration, job application form, support form, etc. Opinio offers complete control of survey design. All common question types, like multiple choice, rating/scale, lists, matrix/table etc, are pre-made and ready-to-use. In addition, you can customize the look & feel and input types to suit your needs down to the last detail. Opinio is designed to be fast and responsive even during high traffic. This allows high volume surveys and many simultaneous publishers. You can add your own functionality by writing additional modules. Start with the included examples, and customize the plugin to provide you with the features you need.