Qubes OS + Whonix is a pretty good alternative compared to just using the Tor browser on Windows.
I've been using Qubes as my main OS for years now.
I take advantage of the structuring of the VM's to make it less likely that I make human error de-anonymization mistakes when using Tor. I use a disposable whonix VM with the Tor Browser for alot of my web access, especially just general browsing around, and have the Noscript plugin defaulting to javascript being completely off.
All the VM's have colored window borders, so it's quick and easy for me to see when I'm using a VM that's connected by clearnet, or through the whonix Tor gateway.
and the standard whonix gateway is configured to use different routes for different VMs, and also to use Torsocks with various commands (e.g. wget) that aren't designed to use Socks proxies.
There is also I2P alternative for TOR, but it needs more development.
I2P would be nice if:
- the main client wasn't Java based. The JVM itself has been a security disaster for years now
- the alternative C++ client was being developed by people who don't write in the Cyrillic alphabet. Trying to figure out their github repo is nightmarish, who knows what's going on?
I like the idea of I2P in principle, not so sure about the reality just yet
Unlike Tor, you can't access regular website/domain with I2P.
There should be ways to bridge out of I2P and back in again. Bitcoin is set to add a new IP announce format with a field designed to be big enough for v3 Tor hidden services and I2P hidden service IP formats (as well as CJDNS)