Kontact is a personal information manager and groupware software suite developed by KDE. It supports calendars, contacts, notes, to-do lists, news, and email. Developed by KDE
License: Open Source
FullContact is a comprehensive contact management solution with extensive API support and real-time data enrichment, making it ideal for businesses seeking robust integration. In contrast, Kontact is an open-source option that offers customization and strong community support, making it suitable for tech-savvy users who prioritize privacy.