D 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.
Database error codes
QR codes is the web portal that is used to generate QR codes based on information from the completed forms or embedded definition file in JSON format. The generated QR code can be embedded on a customer website. It is also possible to generate events to calendars, business cards (vCard or MeCard), Geo location using GPS coordinates, text SMS messages, connect to the Wifi network and more.
Mailing system is the web service similar to MailChimp used for mass sending of personalized newsletters of companies. The system supports the management of the entire life cycle from preparation the newsletter to its delivery. Results (sent, delivered, opened, unsubscribed and bounced counts) can be than exported from the system.