W WorldOpinion is the web portal that collects statistical data of public opinions through simple questions with answers offered for election by registered users. Data are displayed as graphs and maps, divided into countries and regions. Each theme also includes a discussion of users who can publicly present their opinions. Users have their profiles similar to Facebook wall. Links to social networks like Twitter, Google+, Facebook or LinkedIn can be used to share themes and ideas.
O2 Archive is the service for secured data storage with guaranteed persistence time called retention class similar to open source solutions such as OwnCloud or Dropbox. It is used to store important documents of companies (law firms, schools, medical facilities, …) that have to be backed up for some time.
Web portal contains a list of the MySQL, Oracle and PostgreSQL database error codes. The code can be found with its description in many localizations and compared its existence through different versions of the database.