Genre: science fiction and fantasy
(1) Cumulus https://www.amazon.com/dp/B01E4L5L6S/
"Cumulus is your new favorite surveillance-fueled dystopian novel. It's a future we can all recognize - and one that we should all be genuinely afraid of."
Amazon AU link: https://www.amazon.com.au/dp/B01E4L5L6S/ no longer free
(2) Na Akua https://www.amazon.com/dp/B01M0355V9/
"Na Akua is a Neil-Gaiman-Makes-a-Disney-Movie of a novel, filled with humor, magic, adventure, romance, suspense, and a core friendship as sweet and funny as any buddy story ever told."
Amazon AU link: https://www.amazon.com.au/dp/B01M0355V9/ no longer free
(3) Shadow Galactic https://www.amazon.com/dp/B00B0ZFT0A/
"Shadow Galactic is a well written space opera."
Amazon AU link: https://www.amazon.com.au/dp/B00B0ZFT0A/ no longer free
(4) Echo https://www.amazon.com/dp/B0757QPQ92/
"A well thought-out sci-fi short."
Amazon AU link: https://www.amazon.com.au/dp/B0757QPQ92/ no longer free
(5) Wounded Worlds: Nihil Novum https://www.amazon.com/dp/B00BVG1394/
"It's the alien invasion apocalypse, but the humans have retaken Earth, and are now taking back (and liberating) the alien empire."
Amazon AU link: https://www.amazon.com.au/dp/B00BVG1394/ no longer free
As usual, these are free at time of posting, please check before buying :)
Edit:
A few more for free
Tiny Instruments https://www.amazon.com/dp/B01239YVYQ/
AU link: https://www.amazon.com.au/dp/B01239YVYQ/
The Fall of Mars https://www.amazon.com/dp/B00EU15438/
AU link: https://www.amazon.com.au/dp/B00EU15438/
The Inhibited https://www.amazon.com/dp/B01G7ABNRK/
AU link: https://www.amazon.com.au/dp/B01G7ABNRK/
Running on Empty https://www.amazon.com/dp/B00Y5O69ZM/
AU link: https://www.amazon.com.au/dp/B00Y5O69ZM/ no longer free
Na Akua no longer free. Watch those clicks boys.