https://www.kontact.in/
Maintainance – Kontact Consortium India Pvt Ltd
kontactconsortiumindiapvtltd
https://kontact.kde.org/
Kontact Suite - The Powerful PIM Solution
Kontact - handle your emails, calendars and contacts within a single window
kontactsuitepowerfulpimsolution
https://api.kde.org/legacy/kdepim/kontactinterface/html/index.html
KontactInterface - Kontact Plugin Interface Library
KDE products API documentation
plugin interfacekontactlibrary