What kind of VPN management system exist?

Question

openvpn

Good day everyone.
I need a VPN server management system (different protocols - PPTP \ L2TP \ OpenVPN \ IKEv2, etc.)
With the ability to create delete users via API or support for AD \ LDAP

Are there any such solutions in the public domain (if paid to buy, it was possible for an individual immediately and do not wait for some kind of checks and moderation)?

*essentially VPN service billing, only without payment functions. for use on their servers (that is, not which clouds are suitable) Google did not give results, only it was found purely for openvpn - but I want a solution that supports different servers (you need to connect poppies without third-party software and blackberry and win desktop, etc.)

Answer 1

Softether VPN fits your description
SoftEther VPN is the world's only VPN software which supports SSL-VPN, OpenVPN, L2TP, EtherIP, L2TPv3 and IPsec, as a single VPN software.
https://www.softether.org/