The paper analyses contest management systems used by the multicultural Bebras challenge community. Starting as a single annual contest in 2004 in a few countries, the Bebras challenge on Informatics and Computational Thinking has spread to over 60 countries and successfully developed a worldwide network. A requisite tool to perform the challenge is a Contest Management System (CMS). Countries have been developing various systems, depending on their practice, the number of participants, financial issues, etc. The overview and analyses of the Bebras CMS used by various countries are presented here. The main focus concerns the Lithuanian Bebras CMS, its development, architecture, functionalities, and thoughts for future improvements.