AutoWave for ThinkorSwim
If the goal is to match QCharts AutoWave ZigZag functionality, then this is the only ThinkScript indicator for ThinkorSwim that does it.
Automatic Trend Lines
This ThinkScript indicator for ThinkorSwim will plot automatic trend lines for the prevailing trend base on calculating second order pivots.
The Sniper Trend
The Sniper Trend indicator for ThinkorSwim automatically draws the most current trend line and will work on any instrument or time-frame.
VBox
I recently watched a video by Scott Landers which described a method by which he uses volume to determine significant areas of support / resistance on intra-day charts. His method …
Polynomial Regression Channel
This stock indicator automatically curve-fits a polynomial regression channel to closing prices with support for linear and complex curves.