WinLogTail - freeware log viewer, monitor and analyzer

Features:

• fast open and browse log files, regardless of file size
• monitor log file for changes live - as new log lines are appended, they are instantly visible in WinLogTail
• "rules" for highlighting, searching and alerting
• rules use either regular expressions or simplified order-insensitive logical patterns
• highliting: specify font style, foreground and background color for any log line according to its content (for example, red color for lines with word "error")
• searching: output certain lines to "filtered view" (also updated live)
• alerting: you can send WinLogTail to background, and it will flash window or play sound as soon as specific line is appended to the log file
• context scrolling: click a line in filtered view, and the main view will scroll to the relevant position
• can define multiple rules at once, modify, delete, rearrange, deactivate etc
• import and export rules
• command-line options to quickly select file, rules and operation mode
• copy to clipboard or export to file - in plain text, RTF or HTML formats
• small executable file with no installation and external dependencies
• free

Limitations of current version:

• unicode logfiles not supported (ansi lat only)
• logfiles >2GB not supported

Screenshot

Version 0.04, 12 Feb 2008, Download 252 kb
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Program documentation

New in 0.01 (25.Oct.2007):

• bugfix: sometimes copy/export from filtered view would not start from the beginning of selection
• bugfix: in tail mode, new lines didn't appear while the file entirely fit in main view (without scrolling)
• optimization: faster filtered view redraws while searching

New in 0.02 (31.Oct.2007):

• bugfix: while searching very large files, the filtered view sometimes didn't redraw until the search was over or the user scrolled.
• bugfix: fixed Courier New, 9 points underline problems
• feature: you can select custom fonts for main and filtered views

New in 0.03 (7.Feb.2008):

• optimization: more filtered view optimization
• optimization: faster operation if logfile grows very quickly (hundrends of kilobytes per second), generating lots of tail-mode search results

New in 0.04 (12.Feb.2008):

• feature: a "new" button to close (unlock) the current logfile, but retain the current rule set. Handy if you want to delete the current logfile and start over.
• feature: you can now search within search results (filtered view), using a conventional "Find..." dialog.
• feature: the Ctrl+F shortcut, anticipated by first-time users, sets focus to the quick-search box.