IT Links.
Useful places to start.

PDFsam Basic

Split, merge, rotate, and extract PDF pages locally.

• Windows
• macOS
• Linux

Choose PDFsam Basic; Enhanced and Visual are separate paid products.

Okular

Read, annotate, and review PDF manuals and other document formats.

• Windows
• Linux

Angry IP Scanner

Discover active hosts and inspect selected ports on a network.

• Windows
• macOS
• Linux

Requires Java; use on networks you administer.

Nmap

Inventory hosts, services, and open ports for authorized network administration.

• Windows
• macOS
• Linux

NPSL and bundled Npcap have specific redistribution and commercial licensing terms.

curl

Test HTTP endpoints, download files, and troubleshoot protocol connections.

• Windows
• macOS
• Linux

Command-line tool; choose a package matching your operating system.

GNU Wget

Download files and mirror web content from scripts and scheduled jobs.

• Linux
• macOS

Official GNU source downloads; use your OS package manager or build from source.

tcpdump

Capture and inspect network packets from the terminal.

• Linux
• macOS

Packet capture generally requires elevated permissions.

mtr

Combine traceroute and ping statistics to investigate latency and packet loss.

• Linux
• macOS

Install through a package manager or build from source.

OpenVPN Community

Build and connect to encrypted VPN tunnels using the Community implementation.

• Windows
• Linux

Community software is free; Access Server and CloudConnexa are separate commercial products.

WireGuard

Set up lightweight encrypted VPN connections between devices and networks.

• Windows
• macOS
• Linux

Requires peer configuration and a reachable VPN endpoint.

OpenSSH

Administer servers securely using SSH, SFTP, keys, and port forwarding.

• Windows
• macOS
• Linux

Install through the OS package manager; Windows provides OpenSSH as an optional feature.

Remmina

Manage RDP, VNC, and SSH connections in a Linux remote desktop client.

• Linux

Microsoft PowerToys

Use window layouts, bulk rename, text extraction, and other Windows utilities.

• Windows

Windows Terminal

Work with PowerShell, Command Prompt, and WSL in a tabbed terminal.

• Windows

WinGet

Install, upgrade, and inventory Windows applications from the command line.

• Windows

Licenses for the applications you install are separate.

System Informer

Inspect processes, services, resource usage, and system activity in detail.

• Windows

Libre Hardware Monitor

Read supported hardware temperatures, fan speeds, voltages, and usage sensors.

• Windows

Sensor availability depends on hardware and drivers.

Bulk Crap Uninstaller

Inventory installed applications and remove unwanted programs in batches.

• Windows

Review the selected applications and leftovers before removal.

UniGetUI

Manage applications from supported package managers through one graphical interface.

• Windows

Installed applications retain their own license terms.

EverythingToolbar

Integrate fast Everything file searches with the Windows taskbar.

• Windows

Requires the separately installed Everything search application.

Flow Launcher

Launch applications, find files, and run workflow commands from a search bar.

• Windows

Third-party plugins may have separate requirements.

AutoHotkey

Create keyboard shortcuts and automate repetitive desktop actions with scripts.

• Windows

Rufus

Create bootable installation and recovery USB drives from ISO images.

• Windows

Writing an image erases the selected USB drive.

Ventoy

Prepare a USB drive that can boot multiple ISO images without rewriting each image.

• Windows
• Linux

Initial installation erases the selected USB drive.