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Consider just reading the lilo's configuration file (lilo.conf if I remember correctly), it's pretty straightforward to deal with. All you need is a text editor (and root privileges to make the changes) and eyes. Adding a new operating system is as easy as copying one of the existing sections from the configuration file (say Slackware's), paste it below, alter the lines to match your other operating system, save, run lilo as root to apply the changes and reboot to get to the other operating system.
On the other hand Grub would be more flexible. You would install it once, and if you installed new operating systems you could just run update-grub to have Grub create a new configuration file for you. Again if I remember correctly (I can't test, because I don't run multiple operating systems on this device) it should find your other operating systems and add them automatically. And no need to "reinstall" Grub to MBR after that, like with lilo, just reboot to see the new menu.
Personally I don't use any type of GUI to manage LILO and I honestly don't see any advantage to using one unless it guides you a lot. Editing lilo.conf is really simple and easy. If you are not used to editing text files as root I suggest learning a simple command line test editor like pico or nano. Even though I can use many others, including emacs and vi, I find myself using pico the most if I am just doing quick edits.
You should definitely use the link onebuck gave you as if you don't know LILO basics a GUI won't be of much help beyond simple configurations.