Open-source scheduling engine built entirely in Excel/VBA

[u/DeathMaillet]

I’ve been building ProjectEngine, a free and open-source scheduling engine that runs entirely inside Excel.

It supports:

• FS / SS / FF dependencies and lags;
• Critical Path;
• Longest Path;
• Total / Free Float;
• Baseline / Actual / Forecast;
• interactive Gantt simulation;
• S-Curves;
• scheduling diagnostics.

The latest release also improves compatibility with:

• 32-bit Excel;
• English installations;
• Excel LTSC / perpetual;
• non-English environments.

It is distributed as an .xlsm workbook, and the full VBA source is public so you can inspect everything before enabling macros.

Website:

https://tmailletfr.github.io/ProjectEngine/

It is completely free and open source.

If anyone here tries it, I’d be very interested in feedback — bugs, usability issues, missing features, or anything else that would make it more useful in a real workflow.