Kalkulator 

Advanced Sci/Eng calculator. Expression evaluation, 18 digits precision, variables, 100 functions, graphs, unit conversion, interpolation, polynomial regression, linear algebra, systems of linear, nonlinear and differential equations, optimization.
calculator math science engineering numerical methods statistics differential equations linear algebra nonlinear equations interpolation wrotniak

Socket Workbench 

Socket Workbench is the definitive tool for analysing socket communications that underlie the Internet and several types of inter-process communication.
sockets socket workbench udp socket tcp udp sockets tcp sockets packet sniffing socket protocols packet sniffer protocol analyzer protocol analyser tcp/ip networking sockets