vpncilla for ipsec
strongswa for ikev

https://support.ipvanish.com/hc/en-us/articles/360008563074-Android-IKEv2-Setup-Using-strongSwan

https://support.ipvanish.com/hc/en-us/articles/360008238754-Android-IPSec-Setup

https://support.ipvanish.com/hc/en-us/articles/32099797183259-WireGuard-App-Android-setup

https://sshs8.com/WireGuard-VPN-config-Germany-free-servers

https://www.freevpn.us/wireguard/de/