From the changelog:

v3.3

Geometric Modelling Kernel (NURBS)

Thanks to Claude Fable 5

• Numerous bug fixes relating to flat surfaces and edges.
• Some bugs relating to curved surfaces fixed.
• Fixes when edges intersect tangent on the edge of a surface.
• Significant reduction in red lines, naked edges, and missing surfaces.

Solver:

• Improved ability to solve constraints with large dimensions/values.
• Improved ability to solve some valid constraints that were failing (not converging) before.
• Constraints that the solver could not satisfy are not deleted (regression in 3.2).

Misc:

• Support for multiple faces for a single font in .ttc files.
• Initialize the color picker to the current color instead of black.
• Fix some file dialog issues.
• Some small improvements in the web version, including making it multi threaded.
• The web version is available on https://solvespace.com/.
• Do not crash when exporting zigzag and stippled lines in vector formats (SVG/PDF/EPS/DXF).
  They are sill not exported.

Translations:

• Added Brazilian Portuguese (pt_BR)

Lots of usability improvements, multi-constraint, an optional QT front end for Linux, merged the experimental web version.
See the full change log for details.

Version 3.0, release candidate 1.