Was wondering where can I access a public NXT testnet node?
Start up Nxt on your local system in Testnet mode and display peers (on the Settings Menu (gear graphic) in the header bar). The peers with a domain name are likely to be public nodes. Here are a few:
nxt.noip.me, raspnxt.hopto.org, node1.forgenxt.com
For example, put node1.forgenxt.com:6876 in your browser to open the Nxt Wallet.
Some of the non-domain name (IP address only) will work too.