A developers’ meeting was held 25-27 March 2026 in the Royal School of Mines, Department of Materials, Imperial College London, UK.
The meeting brought together developers of Wannier90 and developers of codes that interface to Wannier90 to support the transition to the new forthcoming library version of the Wannier90 code (v4.x). There were over 20 participants with many codes represented.
We are grateful to UKRI (via the Research Software Maintenance Fund) and CCP9 for funding.