OpenVPN GUI (open source under GPLv3 license) with additional features like:

• User-friendly UI
• Multiplatform support: Windows, OS X, macOS, GNU/Linux (with particular effort to support a lot of distro) with multiple architectures: x64, x86, armv7i (Raspberry)
• Censorship counter-measures, like tunnel over SSH, over SSL, direct Tor integration
• Network lock / leak prevention
• Advanced options for DNS, routing, events, leak etc.
• Support of VPN service providers (under development, currently it supports only AirVPN)
• Customizable actions triggered by events
• CLI edition Eddie is developed by and is the official client of [AirVPN] (https://airvpn.org ), a VPN service based on OpenVPN and operated by activists and hacktivists in defence of net neutrality, privacy and against censorship. Currently release 2.x supports only AirVPN authentication and servers. Support of other VPN providers exists but is still under beta-stage.