Better alternatives to common command line tools? [closed]

I've recently found some awesome replacements for common command line tools and wanted to share them and learn about others.

The three of these have made my recent troubleshooting much more efficient:

• ack - ack is a tool like grep, designed for programmers with large trees of heterogeneous source code
• dstat - replacement for vmstat, iostat, netstat, nfsstat and ifstat
• mtr - mtr combines the functionality of the 'traceroute' and 'ping' programs in a single network diagnostic tool

What tools do you install because they're better than the defaults?

Solution 1:

• htop - "It is similar to top, but allows to scroll the list vertically and horizontally to see all processes and their full command lines."
• links or elinks - replacements for lynx
• gt5 - du browser

Solution 2:

sup - gmail like command-line mail client (replacement for mutt).