Essential Net-Tools

Tamosoft has a free network utility program called Essential Net-Tools.

Network scan, Wifi analysis, Netstat, advanced ping, SNMP and nslookup utilities, socket listener, socket writer (TCP and UDP), and quite a few more.  A feature-packed 8MB download!

https://www.tamos.com/products/nettools/

Firefox Developer Edition

Firefox, but with the developer tools you need to monkey around.

https://www.mozilla.org/en-US/firefox/developer

The one true, best way to send large files

Haha no, there are a million different ways.  This q&a on hackernews has a lot of suggestions to try.

https://news.ycombinator.com/item?id=24351111