Want to give a shout out to an alternative to Apollo, which is GraphQL Yoga[0]
It tends to support the latest accepted RFCs of the GraphQL spec, works with subscriptions, can do a form of federation via Schema Stitching[1] and is a blast to work with.
The company behind it (The Guild) also has a service called Hive[2] that can provide analytics, schema checks, manage gateways etc.
For complex cases, they also have GraphQL Mesh[3] as an alternative to Apollo Gateway
[0]: https://the-guild.dev/graphql/yoga-server/docs
[1]: https://the-guild.dev/graphql/stitching/docs