There are "moreutils"...

There is a list of interesting commands set comes with "moreutils"...

http://joey.kitenet.net/code/moreutils/

• combine: combine the lines in two files using boolean operations
• ifdata: get network interface info without parsing ifconfig output
• ifne: run a program if the standard input is not empty
• isutf8: check if a file or standard input is utf-8
• lckdo: execute a program with a lock held
• mispipe: pipe two commands, returning the exit status of the first
• parallel: run multiple jobs at once
• pee: tee standard input to pipes
• sponge: soak up standard input and write to a file
• ts: timestamp standard input
• vidir: edit a directory in your text editor
• vipe: insert a text editor into a pipe
• zrun: automatically uncompress arguments to command

interesting ones pee,parallel,vipe etc..

Packages can be downloaded from :

http://packages.debian.org/unstable/utils/moreutils

for Mac Users try installing via port:

$ sudo port install moreutils




You can have a look on "num-utils" also:
http://suso.suso.org/programs/num-utils/


Thanks,
Satya