faces

Faces is both a front-end and a calculating library for complex project plans expressed as Python code. The library is solid and allows extremely fine control over the project structure, resources, schedule, etc. UI has some very minor glitches but other than that works very well and has advanced features such as code completion and poster-printing of Gantt charts. The project also has excellent documentation. It does take some getting used to "programming" a project plan in Python, but even without knowing this language Faces will become usable in a very short time. Anyone who's not happy with making project plans in Microsoft's tool should give Faces a try.