Perf4J 0.9.7 -
http://perf4j.codehaus.org/

Perf4J is a set of utilities for calculating and displaying perfomance statistics for Java code. For developers who are familiar with logging frameworks such as log4j or java.util.logging, an analogy helps to describe Perf4J: Perf4J is to System.currentTimeMillis() as log4j is to System.out.println()

Perf4J

Java performance tool

Python logging console for Firebug

FirePython is a sexy Python logger console integrated into Firebug.

Scribe is a server for aggregating log data streamed in real time from a large number of servers. It is designed to be scalable, extensible without client-side modification, and robust to failure of the network or any specific machine.

Facebookのログ収集ソフトウェア

Looks like a handy addition to the toolkit

"Rails log file viewer."

log analyzer app for rails logs

Spike is a log file viewing & (if we’re being generous) analysis tool for Rails developers.

Desktop app for the Mac that shows Rails log files.

%D リクエストを処理するのにかかった時間、マイクロ秒単位

Apacheのマニュアル読めってこと

A cool tool for reporting errors on ASP.NET web sites

via Scott Hanselman's Computer Zen

Blackbird offers a dead-simple way to log messages in JavaScript and an attractive console to view and filter them. You might never use alert() again.

javascript logging utility

Great looking js logging console for all browsers

code.interact(), Python debugger and logging

und the current line. Let's give it a try:

pipe

Script lets you scroll logfiles automatically colorized making them a TON easier to read at a glance!

stream live logs from your Ruby, Haproxy, and Nginx processes into your Splunk database for easy debugging and profiling. Of course, same procedures apply to any other process on a remote server - make it log to syslog, and you can route it to Splunk!

Logging level definition

A recent Stack Overflow post described one programmer's logging style. Here's what he logs: