What electronics tools exist to electronically master the agile process like Scrum, Kanban, and others?

Since this question surfaces every now and then, answers collect here (in alphabetical order).

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Contributors:

  • Serge Beaumont
  • Erica
  • Theo Gerrits
  • Olav Maassen
  • Pieter Rijken
  • Yves Hanoulle
  • Jem