Bitrix24 is total business management software that's 100% free. You get over 35 free tools, like CRM, tasks, document management, project management, time management, business process automation, invoicing, collaboration, absence management, email marketing, virtual PBX, shared calendars, company directory, HRMS and much more. Available in cloud and as software that you can install on your own server, it's ready to be used in less than 30 seconds.