The Reddit Multimode System

There are other multimode systems which bridge the various digital voice modes, but this one is very simple to access and works well.
The D-Star connection does exhibit some delays and slight stability issues, but it is still good.
The DMR connection is very good.
The C4FM Fusion link sounds the best to me.

The information for accessing each of these modes is as follows:

For D-Star use either reflector XLX216E or (preferably) DCS216E
For DMR use Brandmeister TalkGroup 98003
For C4FM Fusion use YSF reflector XLX216

Enjoy!