IPsec With PSK for Windows
IPsec With PSK for Android
IPsec With PSK for iOS
IPsec With PSK for Ubuntu
IPsec With PSK for Linux

L2TP for Windows
L2TP for Android
L2TP for iOS
L2TP for Ubuntu
L2TP for Linux

IKEv2 for Windows
IKEv2 for iOS
IKEv2 for Ubuntu
IKEv2 for Linux