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TaskWarrior might be interesting too.
You might be able to do this with timetrap. It is a command-line utility which uses the concept of "timesheets". So, each of your timers A, B, C, can be a timesheet and you can use text commands to start/stop/display etc.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.