SlickEdit Standard 2016 will support very primitive code navigation using ctags (not etags, I need to correct the readme).
If your cursor is on a symbol, you can hit Ctrl+Dot, and it will attempt to use the ctags file the you built to locate the definition of the symbol. Also, auto-complete will support completions using ctags based tag files. It is not context aware, and it only knows about files in your workspace (if you use SlickEdit to build tags).
You will still need SlickEdit Pro to have references, list-members, function argument help, Preview tool window, or the Find Symbol tool window.
If you are using something like VIM with tags, this might be the missing link to get you to try out SlickEdit, but it is nowhere close to the tagging capabilities of SlickEdit Pro.