Keeper Alternatives

Keeper is described as 'Open-source calendar syncing tool that can be used to sync the blocks of time marked as "busy" on your personal, work, business and school calendars' and is a Calendar app in the office & productivity category. There are more than 10 alternatives to Keeper, not only websites but also apps for Windows, SaaS, Mac and Microsoft Outlook. The best Keeper alternative is Outlook Google Calendar Sync, which is both free and Open Source. Other great sites and apps similar to Keeper are OneCal, SyncThemCalendars, gSyncit and Outlook CalDav Synchronizer.