How to improve reading of log files

There are hard times when a sysadmin have to read a lot of rows of log files for troubleshoot a system error. In this times can be helpful to use some tools to improve reading of these files.

I've found two tools:

• Generic Colouriser (GRC) - https://github.com/garabik/grc - there are programs: grc and grcat. The main is grcat, which acts as a filter, i.e. taking standard input, colourising it and writing to standard output. Then you can use configuration files for customize color ouput depend on you application output log. 
• Log File Navigator (LNAV) - http://lnav.org/ - this is a real log file navigator that parse content of file and follow the stream for read latest lines. Lnav can help highlight the parts that are important and filter out the noise.