(Free)

Pre-made portables are the #1 vehicle for malware. Before running any, upload the .exe to VirusTotal.com . If more than 3 engines flag it as a trojan or keylogger, delete it immediately.

If you are using a computer where you don't have permission to install new software, a portable app is often the only way to get work done.

Portable versions do not receive automatic security patches. You must manually find a newer build to stay protected against vulnerabilities. Better Alternatives for Mobile Productivity