Package which you must install
You must install package package and anything package.
Repository
magit package helps git repository.
Documentation
org-mode package creates HTML.
Web browsing
w3m helps web browsing on emacs with CUI.
Programing
Packages for programing are as below.
C/C++
Packages for C/C++ are as below.
Python
Packages for python are as below.
Shell script
Packages for shell script are as below.
Swift
Packages for swift are as below.