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Dev tools · August 26, 2026

ProjectEngine for Excel

A dependency-driven scheduling engine built inside Excel

What it does

ProjectEngine turns Excel into a dependency-driven scheduling and project-controls tool. It calculates task dates from FS, SS and FF links, identifies critical path and float, manages baseline, actual and forecast dates, and generates interactive Gantt charts, dashboards and S-curves. It runs locally with no installer, server or account, and the complete VBA source code is open.

ProjectEngine is an open-source, dependency-driven scheduling and project controls engine for Microsoft Excel. Critical Path, float, simulation, Drag & Drop, Gantt, dashboards and S-Curves — all inside Excel.

A dependency-driven scheduling and project controls engine for teams that need more than a static Excel Gantt chart. Drag a task, propagate the dependency network, recalculate the Critical Path and float, then return safely to the last calculated plan with Reset. The Gantt, analytics, Dashboard and S-Curve consume the same calculated planning data. FS, SS and FF relationships, positive or negative lags, multiple predecessors, calendars, milestones, constraints and automatic propagation. Critical Path, Longest Path, Total Float, Free Float, Driving Logic, variance, deadlines and multi-project criticality. Non-destructive TEST, complete SCENARIO alternatives, live Drag & Drop analytics, safe…from tmailletfr.github.io

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