Contacts GitHub Repositories (2026) · Open Source Tools

DAVx⁵ is an open-source CalDAV/CardDAV suite and sync app for Android. You can also access your online files (WebDAV) with it.

Built from the ground up for speed. Flectar Mail delivers native performance, instant startup, and about 20 MB of private memory at idle.

EspoCRM – Open Source CRM Application

Modern Android dialer with built-in contacts, fast call history, AMOLED themes, dual-SIM support, privacy-focused calling, and rich contact management — a powerful alternative to Google Phone

Telegram MCP server powered by Telethon to let MCP clients read chats, manage groups, and send/modify messages, media, contacts, and settings.

SMS Import / Export is a simple Android app that imports and exports SMS and MMS messages, call logs, contacts, and blocked numbers from and to JSON / NDJSON files.

📇 Contacts app for Nextcloud

Open Source Laravel CRM Package

SuiteCRM - Open source CRM for the world