OpenConnect VPN Server (ocserv)
6.1#34 in virtual private network softwareFree planFree planLinuxSelf-hosted
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You want what its maker publishes above — check its page for the details.
Windscribe suits users seeking a VPN across desktop, mobile and web, including those who want streaming or torrent support. Its free and Build-A-Plan options may suit users selecting a more limited data allowance or chosen locations.