Analog PHP is a short and simple logging package for PHP 5.3+ based around the idea of using closures for configurability and extensibility. It functions as a static class, but you can completely control the handling of log messages through closures (aka anonymous functions), and it also comes with a dozen pre-written handlers. It is well-documented, with examples for each type of log handler, and ultra-concise. The core is literally only 43 lines of clear, non-obfuscated code, and the whole is only a fraction of the size of comparable packages (for example, 293 total lines vs 1021 for Monolog).
GLBOX is a lightweight version of a sandbox. It monitors the execution of any program, regardless of the programing language in which it was written or the accessibility to source code. Since all processes access operating system resources via system calls, controlling those calls is the most general way to monitor a program's behavior.
OSSP fsl offers the syslog API otherwise provided by libc. Instead of writing to the syslogd process, it uses the powerful OSSP l2 logging capabilities. It is a drop-in link-time replacement which enables any syslog consumer to take advantage of OSSP l2 by just linking this library in before libc. The program is intended to apply OSSP l2 functionality to existing syslog-based third-party programs without the requirement to change the source code of the program.
OSSP l2 is a C library providing a very flexible and sophisticated Unix logging facility. It is based on the model of arbitrary number of channels, stacked together in a top-down data flow tree structure with filtering channels in internal nodes and output channels on the leave nodes. Channel trees can be either constructed manually through lower-level API functions or all at once with a single API function controlled by a compact syntactical description of the channel tree. For generating log messages, a printf-style formatting engine is provided which can be extended through callback functions. The data flow inside the channel tree is controlled by logging message severity levels which are assigned to each individual channel.
newsyslog is a faithful Perl rewrite of the MIT newsyslog utility, with a number of features taken from the FreeBSD and NetBSD variants of newsyslog. It archives log files based on size, date or interval, and can optionally compress archives with gzip or bzip2. Complete documentation is available via "perldoc newsyslog.pl".
The XLog class can be used to write log messages to PHP or INI files. It can write details about events to log files that may include details such as event file, event line, event time and date, current page URL, and remote user IP address. The class can write to log files in either plain text format, INI format, or a PHP file that wraps the log messages in comments.
epto is a small library and framework for industrial strength shell script programming with sh. It features convenient error handling, tracing, logging, option handling, documentation template, process level transaction safety (sort of), and more. If one is used to shell programming, it takes less than five minutes of learning to start using it (see the crash course in the README file).