RedBook is an interactive Ruby script able to:

• Log your daily activities onto a YAML file (multiple log files supported).
• Export a set of activities to a txt, csv or yml file.
• Display activities matching a specific string (Regexp supported), tags (with boolean operators), or time frame.
• Calculate the time elapsed between two or more logged activities.
• Calculate the number, the duration, the average and total time spent on a set of activities matching user-specified criteria.
• Update and delete logged activities.
• Backup, archive and restore log files.
• Evaluate arbitrary Ruby code, for example to act as a "emergency calculator" when needed.

• International characters and character encoding conversions.
• Completion for directives and tags.
• Custom key bindings.
• User-defined variables

Announcements:

• Release 0.5.0
• Release 0.4.0
• Release 0.3.0
• Release 0.2.0

Screenshots:

RedBook on Windows...

...and on Linux (yes, with colors)