BST-1 consists of three modules that can be used independently - Contacts' Manager, Email Distributor, and BST Accounting. Contacts' Manager software is to help small businesses to maintain and manage the database of different groups of contacts. Also it allows interacting with email system software to send professionally looked emails using a single address or list of recipients. It is simple, and it is easy to use. Email Distributor is to help small businesses to maintain the lists of different groups of contacts (address books) and to send personalized email messages automatically to many recipients, as well as, to a single one. The software allows using different templates for different purposes, including newsletters. Users can prepare and send a message in a plain TXT-format or in HTML-format. BST Accounting tool is small business financial software (bookkeeping, accounting, and reporting) to help small businesses with basic accounting. It is simple, and it is easy to use. It protects transactions from errors and ensures the reconciliation of all reports. To use this module it is necessary to have MS Excel installed on the PC.