Looks like the one Saratoga posted for free. And then there's this one (not a placefile though): lightningmaps.org
I failed to mention that I also have Allisonhouse...have had them for years. They are the best for overall placefiles they offer.
I also use the Blitzortung lightning placefile Saratoga posted. It uses the same data that lightningmaps.org has. I keep the lightningmaps.org website up on a dedicated monitor in the basement 24/7. You could say I'm a lightning data fanatic. I have the USPLN lightning access from hosting one of their sensors, but their network misses several strokes compared to the ENTLN. The Blitzortung network is coming along...but it does not pick up the in-cloud strikes that ENTLN does, which often increase dramatically in the maturing stages of a thunderstorm.
I'm hoping to host a Blitzortung sensor soon. I'm on the waiting list. I would love to provide additional coverage for the Southeast US.
Here is a couple of the comparisions I captured a few minutes ago. The first image is Allisonhouse lightning, second is the Blitzortung Saratoga placefile, and third is the placefiles.us.to data. For any lightning fans like myself...the results are clear. [ You are not allowed to view attachments ]
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