I've been active on various modes at different times.  Currently, I am involved in the following:

IRLP - I operate IRLP node 6390 on VK3RTL (438.600), as well as IRLP reflector 9550, the second Australian IRLP reflector and a major hub for IRLP and EchoLink.

EchoLink - VK3RTL also supports EchoLink (VK3RTL-R).  I also host several EchoLink conferences, and I am one of the original developers of EchoIRLP.  I also implemented the integrated IRLP/EchoLink conferences, which allow users of IRLP and EchoLink to communicate with each other.

D-STAR - Can be heard on REF003 C, usually using my 2m simplex hotspot.  I also operate REF023 and XRF013 for use by global D-STAR community.

WICEN Victoria - Emergency communications is an interest of mine.  I'm active on the HF net and usually run the IRLP/EchoLink net.

Elmering - I get satisfaction from sharing knowledge that I have gained over the years, and helping newcomers gain new skills and understanding.

I can be found on IRLP node 6390 (often connected to reflector 9559/*AUSSIE*), or REF003 C on D-STAR.