crossoverJie/cim
📲cim(cross IM) 适用于开发者的分布式即时通讯系统 observed · 2026-08-28
Health v2 · maintenance only
57/100
- Activity 75
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 245
- age_days: 3027
- days_rel: 450
- days_push: 151
- n_releases_24m: 2
Adoption not part of the score
9492 stars · 2866 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
CIM (Cross IM) is a distributed instant messaging system for developers built with Java, Netty, and Spring Boot. It provides server and client components plus an SDK for building scalable IM platforms, app message push, and IoT massive-connection messaging.
Use cases
- build a distributed instant messaging system
- push messages to mobile apps at scale
- handle massive IoT device connections with long-lived TCP
- learn Netty long-connection heartbeat and reconnection design
- run group chat and private chat for developers
- embed a chat client SDK into my own application
When to choose
- you want a self-hosted, developer-oriented IM foundation in Java
- you need horizontal scaling with Netty-based TCP long connections
- you want a learning reference for high-concurrency messaging architecture
When to avoid
- you need a production-ready turnkey chat product with web/mobile clients out of the box
- you need offline messages and message encryption, which are not yet implemented
- your stack is not JVM-based and you cannot run Java servers
Facets
framework · maturity active
websocket message-queue rpc middleware http-server messaging-platforms developer-tools iot jvm cross-platform instant-messaging netty tcp heartbeat chat distributed-systems protobuf im-sdk messaging real-time docker
3 sources
- readme: https://github.com/crossoverJie/cim · fetched 2026-08-28 · 335661abe8ca
- homepage: https://crossoverjie.top/categories/Netty/ · fetched 2026-08-29 · 4a0d62ab9b88
- site_page: https://crossoverjie.top/about · fetched 2026-08-29 · 4516b2c2951a
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| crossoverJie/cim | main | 57 |
For agents
markdown · JSON · MCP: product_card(name="crossoverJie/cim")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem