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Terrastruct Open-Sources TALA Under MPL-2.0, Releasing the Paid Layout Engine That Was the Whole Open-Core Split
On 2026-09-07 the D2 project released TALA, Terrastruct's orthogonal autolayout algorithm for software architecture diagrams, under MPL-2.0, the same license as D2 itself. TALA was the proprietary half of the open-core business and the reason a free D2 install produced DAG-style layouts while the paid product produced whiteboard-style ones; it uses a default of 3 random seeds to search for a layout and the post is candid about nonlinear scaling on large diagrams and poor DAG handling. This is the second shoe dropping after the Terrastruct shutdown and D2's move to Hack Club: the open-core moat is now gone, not just the company behind it.
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