Developer builds open-source project scheduling engine entirely in Excel and VBA

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A developer has created ProjectEngine, an open-source scheduling tool built entirely within Excel using VBA, designed for teams that lack access to professional tools like Microsoft Project or Primavera P6. The engine handles dependency-driven date calculations, critical path analysis, float calculations, and interactive Gantt charts, all running locally without any external software or cloud services. Most of the scheduling logic operates in memory via arrays and dictionaries rather than relying on worksheet formulas, which significantly improves performance. The project was motivated by the widespread use of Excel as a default planning tool in environments where dedicated project management software is unavailable or restricted. The full source code is released under the GPL-3.0 license and is accessible through the project's public website.

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