We have written our own OpenVPN GUI from scratch and licensed it as GPL-2.0. It is written in C++ with Qt5 and ships with the latest OpenVPN binaries for Windows and macOS.
Download for Windows 
Download for macOS SHA256 Windows checksum: ad5b961dcca26687ba322efdb1d49e8e044f0e1fa6588363b573810c55eb7db7
SHA256 macOS checksum: 2369690e4810ea1907f9e706529130aeffa9a5c9969324d19c6fcec70f342093
Currently we have only pre-built installers for Windows and macOS, which you can download above. For Linux, you will have to compile it yourself for now, check out our Github repository for more information about that.
GitHub repository