Allegedly, the first software suport tool for project management was developed by Datasaab for their computer D21 in the early 1960s. It was tailored to support the PERT model. Nowadays project planning software is widely used and abused.
To make things worse, many packages offer advanced visual formatting capabilities, which make it possible to produce nicely-looking but completely nonsense documents.
Many packages also offer e-mail integration, which encourages automatic assignment of tasks and due dates. This universally leads to counterproductive, date-driven behavior (see: critical chain) and may contribute to improper setting of team members' performance expectations.