strongSwan 5.3.2 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The actual developer of this free software for Mac is revorsec AG. The program belongs to Internet & Network Tools.
From the developer:
strongSwan is an open source IPsec-based VPN solution.
Main features:
- Implements both the IKEv1 and IKEv2 (RFC 5996) key exchange protocols.
- Fully tested support of IPv6 IPsec tunnel and transport connections.
- Dynamical IP address and interface update with IKEv2 MOBIKE.
- Automatic insertion and deletion of IPsec-policy-based firewall rules.
You may want to check out more software for Mac, such as FileMaker Server or RUMped, which might be similar to strongSwan.