WebDAV Collaborator for Outlook is described as 'The WebDAV Collaborator is a powerful plug-in for synchronizing your CalDAV calendar and/or CardDAV contact data to Outlook' and is an app in the Remote Work & Education category. There are more than 10 alternatives to WebDAV Collaborator for Outlook for a variety of platforms, including Windows, Microsoft Office Outlook, Online / Web-based, Android and iPhone. The best alternative is Outlook Google Calendar Sync, which is both free and Open Source. Other great apps like WebDAV Collaborator for Outlook are Outlook CalDav Synchronizer (Free, Open Source), GO Contact Sync Mod (Free, Open Source), AkrutoSync (Paid) and Outlook4Gmail (Freemium).
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.
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.
Sync your Wunderlist to-dos with Microsoft Outlook (2010, 2013, 2016). You can view and edit existing to-dos and create new to-dos. It's possible to turn e-mails into new to-dos, follow up on e-mails and upload files.
Synchronize Microsoft Outlook between computers using external USB device, shared network folder or FTP. Sync Outlook contacts, calendars (appointments, meetings and all events), tasks, notes and e-mails without a server. Share Outlook folders on your laptop with your desktop.
ECO enables Outlook to sync with CardDAV & CalDAV services like iCloud, Google, Outlook.com, 163, QQ, MIUI, Toodledo,and Yahoo!, Mac OS X server, Baikal, EVO, Zimbra, SOGo, Synology, Kolab, DaviCAL, MailEnable, Kerio Connect, and ownCloud.