Wine is very easy to install.
It is not an emulator and therefore has very good response time.
After installing Wine, just download Ti58, unzip it and run the install (setup.exe) like for Windows.
Ycalc is an X-window calculator.
With much more functions than the standard xcalc (X11), she is heavily influenced by TI59.
Ycalc supports several more operations and has 99 memories.
Especially nice is it binary mode.
Ycalc for Puppy Linux
Ycalc exists on PuppyLinux (and its french version ToutouLinux).