Delayed end-of-day version is free and is very nice for charting (uses ASX data only, I believe). There is also a paid live version.
If you have a CFD account with IG, you can get the live version (with both ASX and Chi-X data) for free if you do a certain number of CFD trades per month (or something like that). Allows you to do trades right off the chart.
Commsec IressTrader (with commsec) also good (the trading platform, but charting is a pain). Haven't use Viewpoint yet (have acess but am really slow with trying new things).