Database Replication, Filtered Synchronization, and Transformation
SymmetricDS is database replication and file synchronization software. It is a platform-independent, web-enabled, and database-agnostic synchronization tool. With initial data load, bidirectional change data capture, conflict resolution, and data transformation, it is a comprehensive data replication solution.
...Clipboard is instantly synchronized across all your devices. It can handle all
forms of text, images and even application-specific data.
HaveClip is multiplatform. Copy something in one OS, paste in another.
Supports Windows, Linux, Mac OS X, Sailfish OS and coming to Android.
Series60-Remote is an application to manage your mobile phone. You can send and receive SMS messages directly on your computer. It also provides a complex contact and file management.
CalDAV sync for Android
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Stopped working on it. Doesn't make any sense to spend more time on it; I recommend e.g. DAVdroid as an opensource and ready-to-use solution on clientside.
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For code look at:
https://github.com/e7o-de/android.caldav
Flexync (Flexible synchronization) adjusts flexibly to your synchronization needs: it is always simple in use and lightweight, runs on many platforms, on single PC or in a network of stationary/mobile agents, and allows you to use advanced options!
The Take Action project consists of a Firefox extension and an iPhone application, meant to interact with the Social Actions API to bring people up to date information on way in which they can make a difference.