Havok
Havok accepts short fiction up to 1000 words (300- to 1000 words). Stories must fit their our daily genres (mystery, science fiction, comedy, thriller, fantasy there are also Seasonal themes.)
Submissions are free. you will be paid $10 if your story is published in an Anthology
An information link on how long they retain the rights is available from the submission guidelines page below.
https://gohavok.com/submission-guidelines/
Freeze Frame Flash Fiction
1000 words of less. For unpublished works, they purchase worldwide First Publication rights in multiple electronic formats, exclusive for one year from first publication, non-exclusive for three years. After that, all rights revert back to the writer.
You get $10.00 per accepted piece.https://freezeframefiction.com/write/submission-guidelines-faq/
Midnight Mosaic
No Pay, exposure only.
Midnight Mosaic is a publication for dark and weird fiction.
“We accept short stories, flash fiction, poetry, and other forms of mixed-genre work.
Our goal is to publish the best work from authors who mix Horror, Sci-Fi, Fantasy, and Weird/New Weird with skill. We also accept…”
https://medium.com/midnight-mosaic/submitting-to-midnight-mosaic-8ada01efc477
Helios Quarterly Magizine
Poetry: Any length paid $50USD per poem.
Fiction: 100-17,500 words paid $0.06 USD per word.
Reprints: Any length of poetry paid $15USD and 100-17,500 words of fiction paid $0.01 USD per word.
https://heliosquarterly.com/submissions/
Every Writer
https://www.everywritersresource.com/top50literarymagazines/
The Grinder
A resource for finding places to submit. It will take some work as you need to serach the individual names on the internet and find their submission pages.
100 Word Short Story
https://thegrinder.diabolicalplots.com/ 100 word short stories.