CatLog shows a scrolling (tailed) view of the Android "Logcat" system log, hence the goofy name. It also allows you to record logs in real time, send logs via email, and filter using a variety of criteria. It has a widget, can record logs in the background and has useful colour coding.
What makes CatLog stand out over similar apps?
* Color-coded tag names
* Easy-to-read column display
* Real-time search
* Recording mode (with widget)
* Save & open from SD card
* Send logs as email or attachment
* Auto-scrolls when at the bottom of the screen (just like tail -f)
* Search autosuggestions & saved filters
* Select parts of logs
* Open-source and ad-free