:books: 免费的计算机编程类中文书籍，欢迎投稿
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The Secure CommsOS™ for mission-critical operations
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
Grab your own sweet-looking '.is-a.dev' subdomain.
The Concise TypeScript Book: A Concise Guide to Effective Development in TypeScript. Free and Open Source.
Privacy-focused encrypted email for everyone. All-in-one alternative to Gmail + Mailchimp + Sendgrid.