https://www.geeksforgeeks.org/c-plus-plus/
C++ is a general purpose programming language and widely used now a days for competitive programming. It has imperative, object-oriented and generic programming features. C++ runs on lots of platform like Windows, Linux, Unix, Mac etc.
https://scapy.readthedocs.io/en/latest/index.html
Scapy is a Python program that enables the user to send, sniff and dissect and forge network packets. This capability allows construction of tools that can probe, scan or attack networks.
https://db-engines.com/
DB-Engines is an initiative to collect and present information on database management systems (DBMS). In addition to established relational DBMS, systems and concepts of the growing NoSQL area are emphasized.
http://detexify.kirelabs.org/classify.html
Anyone who works with LaTeX knows how time-consuming it can be to find a symbol in symbols-a4.pdf that you just can’t memorize. Detexify is an attempt to simplify this search.
http://demangler.com/
GCC and MSVC C++ Demangler
graphsketch.com
Online draw math functions
godbolt.org
Compiler Explorer is an interactive tool that lets you type code in one window and see the results of its compilation in another window. Using the site should be pretty self-explanatory: by default the left hand pane is the source window and the right hand has the assembly output.
cloc
cloc counts blank lines, comment lines, and physical lines of source code in many programming languages
c4model.com
The C4 model for visualising software architecture
