I tried to download SimpleTick but am getting an error "OOPS page not found". Also, the domain for the tabata timer is not working.
For palm I found two I like so far, though none perfect.
Has up and down timer/stopwatch. Large start/stop button and display. Can also use up/down button to control. Great for D1 & D3.
Has multiple timers on one screen. Good for D2. I set 5 up timers and then one down timer on the bottom. Then just started/stopped for each set, and reset the down timer for rest breaks.
There is also Parallel lap http://www.freewarepalm.com/clock/parallellap.shtml
Does laps really well, but only up timers. I guess it might be good for D2 also, but no alarm for the break times.