We’ve just released the first release candidate for Wt 4.4.0 and Wt 3.7.0.
Among other things, this release adds support for multiple X axes to the 2D charts.
More information in the release notes.
Here are the links:
Wt 4.4.0 RC 1: download wt-4.4.0-rc1.tar.gz (release notes)
Wt 3.7.0 RC 1: download wt-3.7.0-rc1.tar.gz (release notes)
Binary builds for Windows are available on the GitHub releases page.