The strict_rfc3339 Python module provides strict, simple, lightweight RFC3339 (Date and Time on the Internet: Timestamps) procedures.

It enables or aims to:

• Convert UNIX timestamps to and from RFC3339.

• Produce RFC3339 strings with a UTC offset (Z) or with the offset that the C time module reports is the local timezone offset.

• Be simple with minimal dependencies/libraries.

• Avoid timezones as much as possible.

• Be very strict and follow RFC3339.

The package ciso8601 converts ISO 8601 or RFC 3339 date time strings into Python datetime objects.

This library provides a timezone database for Python.

rdate connects to an RFC 868 time server over a TCP/IP network, printing the returned time and/or setting the system clock.

This package includes the necessary headers for using LinuxPPS PPSAPI kernel interface in user-space applications, and several support tools.

Pendulum is a drop-in replacement for the standard datetime class, providing an alternative API. As it inherits from the standard datetime all datetime instances can be replaced by Pendulum instances.

Python-isodate is a python module for parsing and formatting ISO 8601 dates, time and duration.

The main purpose of this package is to provide more complex arithmetic operations on dates/times. Heavy use is made of the relativedelta type from the dateutil library. Much of this package is just a light wrapper on top of this with some added features such as range generation and business day calculation.

tz helps you schedule things across time zones. It is an interactive TUI program that displays time across a few time zones of your choosing.

This package provides a data type for representing time slots with a start and end. It completes the datetime Python module, which can represent a time, a duration, a timezone, but not a range or interval.

Termdown provides a fancy text display while it counts down to zero from a starting point you provide. The user can pause and resume the countdown from the text user interface. It can also be used in stop watch mode which counts forward or for just showing the current time.

The Crypt::OpenSSL::Guess Perl module provides helpers to guess the correct OpenSSL include path. It is intended for use in your Makefile.PL.

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols. It is provided in the form of a C library to support the protocols, as well as to parse and write X.509, PKCS #12, OpenPGP and other required structures.

Dehydrated is a client for obtaining certificates from an ACME server (such as Let's Encrypt) implemented as a relatively simple Bash script.

LibreSSL is a version of the TLS/crypto stack, forked from OpenSSL in 2014 with the goals of modernizing the codebase, improving security, and applying best practice development processes. This package also includes a netcat implementation that supports TLS.

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols. It is provided in the form of a C library to support the protocols, as well as to parse and write X.509, PKCS #12, OpenPGP and other required structures.

GNU libtasn1 is a library implementing the ASN.1 notation. It is used for transmitting machine-neutral encodings of data objects in computer networking, allowing for formal validation of data according to some specifications.

Certbot automatically receives and installs X.509 certificates to enable Transport Layer Security (TLS) on servers. It interoperates with the Let’s Encrypt certificate authority (CA), which issues browser-trusted certificates for free.

ACME protocol implementation in Python

This library provides a C99 implementation of SSL/TLS. It is designed to be familiar to users of the widely-used POSIX I/O APIs. It supports blocking, non-blocking, and full-duplex I/O. There are no locks or mutexes.

As it can be difficult to keep track of which encryption algorithms and protocols are best to use, s2n-tls features a simple API to use the latest default set of preferences. Remaining on a specific version for backwards compatibility is also supported.

OpenSSL is an implementation of SSL/TLS.

Crypt::OpenSSL::Bignum provides multiprecision integer arithmetic in Perl.

mbed TLS, formerly known as PolarSSL, makes it trivially easy for developers to include cryptographic and SSL/TLS capabilities in their (embedded) products, facilitating this functionality with a minimal coding footprint.

The wolfSSL embedded SSL library (formerly CyaSSL) is an SSL/TLS library written in ANSI C and targeted for embedded, RTOS, and resource-constrained environments - primarily because of its small size, speed, and feature set. wolfSSL supports industry standards up to the current TLS 1.3 and DTLS 1.2, is up to 20 times smaller than OpenSSL, and offers progressive ciphers such as ChaCha20, Curve25519, NTRU, and Blake2b.