Realtime collaboration solutions are becoming increasingly popular among developers looking to build similar collaborative features into their applications. These solutions, such as APIs and SDKs, enable developers to add realtime collaboration capabilities without having to build the underlying infrastructure necessary to support them. Some of the best collaboration APIs and SDKs include Ably, Liveblocks, Replicache, Cord, and PubNub. Each solution has its own unique qualities and advantages, and it's crucial for developers to consider their specific needs and requirements before choosing a solution.