1. A "Golden Site" Web Contest engine, with a PostgreSQL-driven database consisting of 20+ tables and 10 stored procedures, with 15 user interfaces for different types of users for such tasks as user management, participants management, voting system, registration, mail list, etc. The engine works smoothly with over a thousand users registered and actively participating in the contest life. 2. Dynamic Web Site Engine. Based on PHP (and its extension module system), key features are: authorization and session system, template parsing, access restriction on site sections, XML menu tree model, etc. 3. e-Commerce: Billing System. Based on an independent precompiled CGI credit card accept module written on C, with integration of PGP encryption. The key feature is the interconnection between Unix server with MySQL database and the client machine with a Delphi client and local SQL database, which received the transaction requests and performed them via the remote service through a secur