session-token is a script, using the Session::Token module, to create session tokens, password reset codes, temporary passwords, random identifiers, etc.

Vector-Optimized Library of Kernels is designed to help applications work with the processor's SIMD instruction sets. These are very powerful vector operations that can give signal processing a huge boost in performance.

Protocol buffers are a flexible, efficient, automated mechanism for serializing structured data - similar to XML, but smaller, faster, and simpler. You define how you want your data to be structured once, then you can use special generated source code to easily write and read your structured data to and from a variety of data streams and using a variety of languages. You can even update your data structure without breaking deployed programs that are compiled against the "old" format.

Paulo Queiroz's collection of useful functions and reusable widgets.

Embark makes it easy to choose an Emacs command to run based on what is near point, both during a minibuffer completion session and in normal buffers. Bind the command embark-act to a key and it acts like prefix-key for a keymap of actions (commands) relevant to the target around point. With point on an URL in a buffer you can open the URL in a browser or eww or download the file it points to. If while switching buffers you spot an old one, you can kill it right there and continue to select another. Embark comes preconfigured with over a hundred actions for common types of targets such as files, buffers, identifiers, s-expressions, sentences; and it is easy to add more actions and more target types. Embark can also collect all the candidates in a minibuffer to an occur-like buffer or export them to a buffer in a major-mode specific to the type of candidates, such as dired for a set of files, ibuffer for a set of buffers, or customize for a set of variables.

Poppler is a PDF rendering library based on Xpdf PDF viewer.