Trike
Computer-aided threat modeling
Trike is a platform-independent tool for systematic, computer-assisted threat modeling, from requirements through deployment.
We are developing Trike v2 on GitHub (https://github.com/octotrike/trike). Our mailing lists are still here on SourceForge, and we're leaving the old code repository & releases up for archival purposes. Plus you probably want to use something while you're waiting for v2.