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This is a tiny, auditable script that you can throw on your server to issue and renew Let's Encrypt certificates. Since it has to be run on your server and have access to your private Let's Encrypt account key, I tried to make it as tiny as possible (currently less than 200 lines). The only prerequisites are python and openssl.

cryptography is a package designed to expose cryptographic recipes and primitives to Python developers. Our goal is for it to be your "cryptographic standard library". It supports Python 2.6-2.7, Python 3.2+, and PyPy. cryptography includes both high level recipes, and low level interfaces to common cryptographic algorithms such as symmetric ciphers, message digests and key derivation functions.

sha is a simple program that hashes files. It uses the National Institute of Standards and Technology's Secure Hash Algorithm. It can use SHA-1, SHA-256, SHA-384, or SHA-512, which generate respectively, hashes of 160, 256, 384, or 512 bits. sha can be used in scripts to do, for example, file integrity checking.

TUF (The Update Framework) helps developers secure their new or existing software update systems. Software update systems are vulnerable to many known attacks, including those that can result in clients being compromised or crashed. TUF helps solve this problem by providing a flexible security framework that can be added to software updaters.

gpsoauth allows python code to use the "master token" flow that KB Sriram described at http://sbktech.blogspot.com/2014/01/inside-android-play-services-magic.html. This is be useful when writing code that poses as a Google app, like gmusicapi does.

scanlogd is a TCP port scan detection tool, originally designed to illustrate various attacks an IDS developer has to deal with. Unlike some of the other port scan detection tools out there, scanlogd is designed to be totally safe to use. -Roman Bogorodskiy <bogorodskiy@inbox.ru>

Zebedee is a simple program to establish an encrypted, compressed TCP/IP "tunnel" between two systems. This allows TCP-based traffic such as telnet, ftp and X to be protected from snooping as well as potentially gaining performance over low-bandwidth networks from compression.

DASH is a POSIX-compliant implementation of /bin/sh that aims to be as small as possible. It does this without sacrificing speed where possible. In fact, it is significantly faster than bash (the GNU Bourne-Again SHell) for most tasks.

CDBKUP is a professional-grade open-source package for backing up filesystems onto CD-Rs or CD-RWs. Features: Supports full or incremental backups. Results are stored as GNU tarballs on ISO 9660 filesystems. Excellent support for multi-session CDs. Large backups can be split between multiple CDs. Supports gzip, bzip2 or no compression.

'di' is a disk information utility, displaying everything (and more) that your 'df' command does. It features the ability to display your disk usage in whatever format you desire/prefer/are used to. It is designed to be portable across many platforms.