Filtron - Create and share your own photo filters on Mac & iPhone
Carousel Maker by Contentdrips - Create carousel posts for IG & LinkedIn from your browser.
CSSCO - VSCO Filters with CSS
Carousel Hero - Create carousels for LinkedIn, Instagram, and TikTok for free and without any sign-up.
Instagram.css - Complete set of Instagram filters in pure CSS
Colofilter.css - Colorful filters uses css blend modes inspired by Spotify