Question: I need a code editor that supports real-time collaboration and allows multiple users to edit the same codebase simultaneously.

If you're looking for a code editor with real-time collaboration, Zed is a top option. The high-performance, multiplayer code editor is designed to be both powerful like an IDE and snappy like a lightweight editor, so it's great for getting work done. It's got real-time shared workspaces, audio and text chat, and location sharing, along with AI-generated code and a multi-threaded design. Zed is based on the open-source Tree-sitter parsing framework and uses CRDTs for language-aware features, so it's designed to be collaborative from the ground up.

Another top contender is Visual Studio, a full-featured development environment with powerful real-time collaboration abilities. Visual Studio lets you write, debug and build code, and it integrates well with GitHub Copilot and IntelliSense. It can be used for cross-platform development, and there are several pricing tiers, including a free community edition, so it's good for casual users and power users.

If you want to add real-time collaboration to your own product, Liveblocks offers a developer toolkit for high-performance collaboration. It's got features like presence, broadcast, comments, sharing and permissions, and it's deeply integrated with popular frontend frameworks and libraries. Liveblocks is customizable and can be used for a variety of use cases, including document editing, creative tools and whiteboards, so developers can focus on their core product.

Last, Replit is a cloud-based environment that supports online and offline collaboration. It's a full featured environment for building, sharing and deploying software as fast as possible, with AI generated code, code completion and debugging. Replit's collaboration tools and deployment abilities make it a good option for developers, with several pricing tiers to match your needs.