Here is Ramstedts list of free programs:

Network
WireShark(Protocol analyzer)
Nmap (Utility for network discovery – also open souce)
Angry IP Scanner
Nagios Core – Nagios (monitor you network)

Tools Collection
Sysinternals (best collection of IT tools)

Graphics
Paint.net
Gimp
Irfanview
Greenshot (Best freeware program for screenshots)

Screen recording
OBS Software (Screen recording and streaming)

Video editing
DaVinci Resolve 18
Hitfilm Express free
3D creation

Players
VLC Player

FTP
Filezilla

Sync/Backup
Skydrive
SQL Backup
SyncBack free

Maintenance
CPU-Z (Specs of the CPU)
HW-Monitor(Voltages, temperatures and fans speed monitoring)
FixWin
CCleaner
Recuva (recover deleted files)
Hashtab (Windows hash calculator)
Razer game booster

Antivirus
AVG free
Malwarebytes

Encryption
Veracrypt (if you don’t have bitlocker)
Truekrypt

File
Qcopy
CDburnerXP
Advanced Renamer (rename many files)
Rufus (make bootable USB Sticks)
SyncBack Free (Good to sync data from A to B and it is free also for commercial use)

Imaging/Kloning
Macrium Reflection
Clonezilla

Virtualization
VirtualBox (freeware VM from Oracle)

Music editor
Audacity

Mail
Gmail – Googles well known mailservice
Outlook.com – Microsofts mailservice

Text Editor
Notepad++

Text and numbers
LibriOffice
Evernote – Remember everything.
FreeMind (make mind maps)

Gaming
Steam

Certificate
KeyStore Explorer – Download (keystore-explorer.org)

VPN
Proton

Div
F.lux (warms up your screen at night zzzz)
ImgBurn (Disc image burning) 
Index (Everything)

Version 2.04 (December 2022)