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VTK reviews and mentions
[Discussion] What are some old C++ open source projects you wish were still active?
10 projects | reddit.com/r/cpp | 5 Apr 2022
You are referring to the Visualization Toolkit right? Looking at that it appears to be actively maintained stilled I think. https://github.com/Kitware/VTK
Kitware/VTK is an open source project licensed under GNU General Public License v3.0 or later which is an OSI approved license.