Kudos to Doug Holton for assembling an "Open Education Scorecard" for software written by the learning sciences community. I've written about many of these projects over the years in individual posts, but it is very helpful to get a nice summary of the state of play.
Ten years after the coining of the term "open source," long after open source software has become mainstream throughout industry, there is very little open source software for K-12 education being written by (US learning sciences) academics. And there is only one thing that will change that: if grant-making institutions change the terms of their funding.
The good news is, they could do that at any time and turn the whole community on a dime. The bad news is, there is no sign they will.
Later... Stephen questions how broadly true my generalization applies. I'm thinking US learning sciences academia here.