The VTK maintenance team is happy to announce that VTK 9.0.0 RC3 is available for testing!
You can find the source, data, documentation tarballs and python wheels for linux and OS X here (the python wheels are made using the default VTK build flags).
Please try this version of VTK, and report any issues to the bug tracker so that we can try to address them before VTK 9.0.0 final. Kindly set the 9.0 milestone on your issue and merge requests for 9.0 to ensure that they are tracked during the remainder of the release process. Further, please base / rebase all 9.0 target branches off of the v9.0.0.rc1 tag to ensure minimal merge conflicts with the release and master branches.
As always, contact Kitware and this discourse site for assistance.