filezilla - the free ftp solution for both client and server. filezilla is open source software distributed free of charge.

the main openssh page

github is where over 100 million developers shape the future of software, together. contribute to the open source community, manage your git repositories, review code like a pro, track bugs and features, power your ci/cd and devops workflows, and secure code before you commit it.

面向企业提供一站式研发管理解决方案，包括代码管理、项目管理、文档协作、测试管理、cicd、效能度量等多个模块，支持saas、私有化等多种部署方式，帮助企业有序规划和管理研发过程，提升研发效率和质量。

掘金是面向全球中文开发者的技术内容分享与交流平台。我们通过技术文章、沸点、课程、直播等产品和服务，打造一个激发开发者创作灵感，激励开发者沉淀分享，陪伴开发者成长的综合类技术社区。

netsarang software combines performance, security, and usability for a complete network connectivity experience.

吾爱破解论坛致力于软件安全与病毒分析的前沿，丰富的技术版块交相辉映，由无数热衷于软件加密解密及反病毒爱好者共同维护

stack overflow is the largest, most trusted online community for developers to learn, share​ ​their programming ​knowledge, and build their careers.