Dwell clicking software that supports right-dragging and allows to define shortcuts I am looking for a dwell clicking software that supports as many following features as possible:


left and right-dragging
double/triple click
a shortcut can be defined to change the mouse mode
the mouse mode window is always on Top
customizable dwell clicking time (i.e. the time one needs to hold the mouse steady in an area before the mouse click is sent)




A few definitions:


Right-dragging = you click the right mouse button while pointing at something, hold down the right mouse button and drag the object somewhere
Dwell clicking = Instead of having to press a mouse button or a switch the user needs to simply hold the mouse steady in an area for a predefined amount of time. This action issues the computer with a 'virtual' click and provides the same function as if someone had pressed the mouse button.




On Windows I use Point-N-Click dwell clicking software: it has all the above-mentioned features (and is free).
DwellClick is a nice dwell clicking app on mac that is customizable, versatile, as well as nice-looking. The following pictures show the hands-free panel and the pop-up panel of the app.




It supports most of the features you mentioned:


single/double click, drag, drag &amp; hold
keyboard shortcuts for changing modes
hands-free panel that stays on top
customizable dwell clicking time


In addition, there are other features such as:


modified click with ⇧, ⌃, ⌥ or ⌘ 
pop-up panel near the mouse pointer to select different modes


The only modes missing from your inquiry are triple click and right drag, but I don't think Mac OS uses these modes. However, it should be easy to configure a desired short cut or action to the modified clicks using BetterTouchTool mentioned above, so that you can use them instead.