Tools/Internet_Gateway
Internet Gateway (IGW)
Horizontally scaled, redundant VPC component providing a route-table target for internet-bound traffic — makes a subnet "public." Purely a routing construct, not a standalone product, so there's no dedicated open-source equivalent; the same role in a self-managed network is filled by a router/NAT device running standard Linux routing (e.g. pfSense/OPNsense) with a public-facing interface.