Bitrix24 is a unified communications platform (free for small businesses) with task management, social intranet, file-sharing, crm, instant messaging, videoconferencing and built-in VoIP telephony.
tags: business-communication communication-tools customer-relationship-manager document-management document-sharingdotProject is a web-based, multi-user, multi-language project management application. It is free and open source software, and is maintained by an open community of volunteer programmers.
tags: calendar-integration gantt-charts multi-language multi-user project-management