NetIRC2 is an easy-to-use .NET IRC client library. It supports all major features relevant to making a chat client or bot. It has full support for synchronization contexts. You can use it from a Windows Forms or WPF GUI thread and chat events will be automatically dispatched, allowing you to completely ignore multithreading. It uses byte arrays internally, so mixed encodings can be handled. The IrcClient class can even be used as a component in the Forms Designer. Because it speeds up connect times with some IRC servers, an Ident server is included as well.
CryptSharp provides a number of password crypt algorithms: BCrypt, MD5 (and Apache's htpasswd variant), PHPass (WordPress, phpBB, Drupal), SHA256, SHA512, and Traditional and Extended DES. It also includes Blowfish, SCrypt, and PBKDF2 for any HMAC (.NET's built-in PBKDF2 implementation supports only SHA-1). If you are looking to store passwords, odds are CryptSharp will have the algorithm you want.
Zebra_cURL is a high performance PHP library acting as a wrapper to PHP's libcurl library, which not only allows the running of multiple requests at once asynchronously in parallel, but as soon as one thread finishes, it can be processed right away without having to wait for the other threads in the queue to finish, eliminating wasted CPU cycles from busy waiting. This result is a faster and more efficient way of processing large quantities of cURL requests (like fetching thousands of RSS feeds at once), drastically reducing processing time. This script supports GET (with caching) and POST requests, and basic downloads as well as downloads from FTP servers, HTTP Authentication, and requests through proxy servers. For maximum efficiency, downloads are streamed (bytes downloaded are directly written to disk), removing the unnecessary strain from the server of having to read files into memory first and then writing them to disk.