Amazon KDP 
The most widely used self-publishing platform. Publish Kindle and paperback books directly to Amazon with no upfront cost.
https://kdp.amazon.com

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BookVault 
UK-based print-on-demand platform with global shipping, direct-to-reader sales, and integration with Shopify. Authors earn high royalties and control pricing.
https://www.bookvault.app/partner/

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Draft2Digital 
Distribute your ebook to major retailers (Apple Books, Kobo, B&N, etc.) with a simple interface. Now merged with Smashwords for even broader reach.
https://www.draft2digital.com

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Gumroad
Sell ebooks, workbooks, and digital downloads directly to readers from your own page. Offers pay-what-you-want pricing and membership options.
https://gumroad.com/affiliates

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IngramSpark 
Global distribution for print and ebooks to bookstores, libraries, and online retailers. Requires setup fee and ISBN management.
https://www.ingramspark.com

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Kobo Writing Life 
Publish directly to Kobo’s global ebook platform and partner stores (including Walmart and Indigo). Great for reaching Canadian and international readers.
https://www.kobo.com/writinglife

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Lulu 
Print-on-demand and ebook platform for authors, educators, and course creators. Offers wide distribution and customizable formats.
https://www.lulu.com

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Payhip 
Sell digital products (ebooks, PDFs, audiobooks) directly from your website or landing page. Includes built-in checkout and affiliate options.
https://payhip.com/affiliates

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PublishDrive
Distribute ebooks, audiobooks, and print books to 400+ global channels including Amazon, Google Play, and libraries. Flat-rate or royalty-share pricing.
https://publishdrive.com/affiliate-program.html

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Smashwords

Longtime ebook distributor focused on indie authors. Now integrated with Draft2Digital to offer free, wide ebook distribution.
https://www.smashwords.com