List of the top 200 is at : https://commondatastorage.googleapis.com/ossf-criticality-sc... (from the repo) So gnucash is #15 . At #75 is gcc . This seems like a great idea, but perhaps some refinements are needed.
Whatever one thinks about Java development, if those two tools disappeared most Java development world wide would stop.
There would always be the lone developers deploying from IntelliJ/NetBeans/Eclipse and a few people using Ant/Bazel/Ivy but I must admit I haven't seen any of those "in the wild" the last three years.