An interesting development is that the MAED software developed by IAEA has now been released by the Climate Compatible Growth project under a BSD 3-Clause License and is available on Github.
On a separate note, while it is not excusable to claim “open source” without actually being open source, I do have some sympathy for the often well-meaning individuals working within highly inflexible and restrictive organisations with conservative legal teams. In some cases, works may be developed under an open source license, but cannot be released due to some legal technicality. I think the idea of an Open Source Programme Office is a good one; but I suspect the challenge is that any organisation that realises they need such an office is probably already 80% there.