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Personal CRM. Remember everything about your friends, family and business relationships.
Certbot is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server. It can also act as a client for any other CA that uses the ACME protocol.
The ultimate Free Open Source Solution for team communications.
A virtual machine for executing programs written in Hack.
A static analyzer for Java, C, C++, and Objective-C