The best open source alternative to gSyncit is GO Contact Sync Mod, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to gSyncit and five of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to gSyncit are Outlook Google Calendar Sync (Free, Open Source), Calendar Sync + (Free, Open Source), Outlook CalDav Synchronizer (Free, Open Source) and Syndesis (Free, Open Source).
GO Contact Sync Mod is an open source tool to synchronize your Microsoft Outlook contacts with Google Mail. With this tool you do not need to enter your contact details more than once, always have the latest version everywhere: in Outlook and in Google.
Almost everyone thinks GO Contact Sync Mod is a great alternative to gSyncit.
This utility synchronizes Outlook calendar and task list entries to a Google calendar, vice versa, and both ways. Create profiles to sync multiple calendars. Modify sync frequency, direction, and filters. Outlook 2007 to 2016 are supported.
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Most users think Calendar Sync + is a great alternative to gSyncit.
Free Outlook Plugin, which synchronizes events, tasks and contacts between Outlook and Google, SOGo, Horde or any other CalDAV or CardDAV server. Supported Outlook versions are 2016, 2013, 2010 and 2007.