I made this recently, it can be usefull when normal tracker isn't working.
http://mrc-members-tracker.alwaysdata.net/
It does not show how long ago someone was online. But it checks everyone once in ~30 seconds (with page update every 5 seconds, so you will see information not older than 35 seconds). I can make it to check everyone every 5 seconds, but I am not sure that alwaysdata.net provider allow this
(it can take up to 900 megabytes per day if set every 5 seconds, maybe more or less, need some testing)
In the bottom of the page you can see last update date in UTC.
I am not sure that this gonna survive on free hosting, but let's see if it does
