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《Hello 算法》：动画图解、一键运行的数据结构与算法教程。支持简中、繁中、English、日本語，提供 Python, Java, C++, C, C#, JS, Go, Swift, Rust, Ruby, Kotlin, TS, Dart 等代码实现
Free and Open Source, Distributed, RESTful Search Engine
Halo 是一款强大易用的开源建站工具，从个人博客、知识库，到企业官网、在线商城，Halo 都能助您轻松实现，一站式满足您的多样化建站需求。
Apache Kafka - A distributed event streaming platform
🔥 人人可用的开源 BI 工具，数据可视化神器。An open-source BI tool alternative to Tableau.
Open-source IoT Platform - Device management, data collection, processing and visualization.
QuestDB is a high performance, open-source, time-series database
PDF Parser for AI-ready data. Automate PDF accessibility. Open-source.
Apache Druid: a high performance real-time analytics database.
Tink is a multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.
Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process …
Open-Source Subscription Billing & Payments Platform
Lightweight Java and Android library for integration with Ethereum clients
XChange is a Java library providing a streamlined API for interacting with 60+ Bitcoin and Altcoin exchanges providing a consistent interface for trading and accessing market data.
Security engine for Java (authentication, authorization, multi frameworks): OpenID Connect, SAML2, CAS, OAuth, LDAP, JWT...
Over 1600 customizable icons for Android including 750+ Google Material Design icons, 25 ready-made social badges, and more!
CloudFoundry User Account and Authentication (UAA) Server
Building Blocks - To help you quickly and easily take to build their own applications.
[UNMAINTAINED] Faceless is where you can talk freely
Lighthouse: a peer to peer crowdfunding app that uses Bitcoin
next version move to https://github.com/billchen198318/hillfog, bambooBSC is an opensource Balanced Scorecard (BSC) Business Intelligence (BI) Web platform. BSC's Vision, Perspectives, Objectives o…