At work we have Splunk in Production. That is a powerful tool that generates timecharts, statistics, tables, groupings from logs in real time. However sometimes I have to analyse logs that are not indexed in splunk, hence I spend a lot of time using grep, awk, sed and excel (to plot graphs).
Do you know any tool that can be easily installed on my local machine and offers features to analyze logs like Splunk?
How about Splunk? :P
Get yourself a Dev license and you'll be able to ingest several gigs of data daily. https://dev.splunk.com/enterprise/
Or just use the free Splunk license, which gives you pretty much all the search capabilities, but a few limits around authentication and alerting. Shouldn't be a problem for a local instance however. Only 500mb a day, but that limit can breached irregularly.
https://www.splunk.com/en_us/software/features-comparison-chart.html