Handboekje

VPN

VPN Virtual Private Network.

AirVPN

https://airvpn.org/
A VPN based on OpenVPN and operated by activists and hacktivists in defence of net neutrality, privacy and against censorship.
(link 228)

NordVPN

https://nordvpn.com/nl/
NordVPN
(link 282)

blackVPN

https://www.blackvpn.com/
blackVPN
(link 227)

Kerio Control VPN Client, All Versions - Direct Download Links

https://www.ryadel.com/en/kerio-control-vpn-client-all-versions-direct-download-links/
Kerio VPN clients are not always backward-compatible, meaning that you could experience connection issues - or not being able to connect at all - if you use a build meant for a Kerio Control different from the one you’re trying to connect to.
(link 226)

WireGuard® is an extremely simple yet fast and modern VPN that utilizes state-of-the-art cryptography

https://www.wireguard.com/
It aims to be faster, simpler, leaner, and more useful than IPsec, while avoiding the massive headache.
(link 311)