Can you recommend some free time travel short stories?

Sure. 'A Sound of Thunder' by Ray Bradbury is a great one. It's about time travel hunters who go back to the dinosaur age for a safari, but one small misstep in the past has huge consequences in the present. Another is 'The Time Machine' by H.G. Wells, which is a classic. It follows a man who travels far into the future and discovers the strange evolution of humanity. And 'By His Bootstraps' by Robert A. Heinlein is also interesting, where the protagonist gets caught in a complex time - travel loop.

I think 'The Anubis Gates' by Tim Powers is a good free time - travel short story. It combines elements of time travel with historical settings and magic. It's full of adventure and mystery. Then there's 'The Light of Other Days' by Arthur C. Clarke and Stephen Baxter. This story delves into the idea of being able to see any point in time through a new technology, which is like a form of time travel in a sense. And 'Time Travelers Never Die' by Jack McDevitt also offers an engaging time - travel narrative with interesting characters and a plot that keeps you hooked.

Well, there's 'All You Zombies -' by Robert A. Heinlein. It has a mind - boggling time - travel plot where the main character has a very unique and convoluted relationship with time and different versions of themselves. Also, 'Time's Arrow' by Martin Amis is worth reading. It's a rather dark and thought - provoking time - travel story that looks at the concept of time and history in a different way. Oh, and don't forget 'The End of Eternity' by Isaac Asimov, which explores time travel and the manipulation of time for the greater good or perhaps not so good.