A list of SaaS, PaaS and IaaS offerings that have free tiers of interest to devops and infradev

Complete Open Source and Modular solution for MMO

🐝 IoT Technical Guide --- 从零搭建高性能物联网平台及物联网解决方案和Thingsboard源码分析 ✨ ✨ ✨ (IoT Platform, SaaS, MQTT, CoAP, HTTP, Modbus, OPC, WebSocket, 物模型，Protobuf, PostgreSQL, MongoDB, Spring Security, OAuth2, RuleE…

Full bitcoin solution written in Go (golang)

大数据入门指南 ⭐

Hyperledger Fabric is an enterprise-grade permissioned distributed ledger framework for developing solutions and applications. Its modular and versatile design satisfies a broad range of industry u…

A community-driven replacement for JSQMessagesViewController

Open source alternative communication platform.

基于Spring+SpringMVC+Mybatis分布式敏捷开发系统架构，提供整套公共微服务服务模块：集中权限管理（单点登录）、内容管理、支付中心、用户管理（支持第三方登录）、微信平台、存储系统、配置中心、日志分析、任务和通知等，支持服务治理、监控和追踪，努力为中小型企业打造全方位J2EE企业级开发解决方案。

阿里云计算平台DataWorks(https://help.aliyun.com/document_detail/137663.html) 团队出品，为监控而生的数据库连接池

All Algorithms implemented in Java

An Open Source Machine Learning Framework for Everyone

Apache Hadoop

The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.