Carousel Maker by Contentdrips - Create carousel posts for IG & LinkedIn from your browser.
Instagram.css - Complete set of Instagram filters in pure CSS
Carousel Hero - Create carousels for LinkedIn, Instagram, and TikTok for free and without any sign-up.
Preppr - Create, schedule and manage your Instagrams from your desktop or smartphone.
Planoly - Planoly: Post Planner for Instagram is a first visual planner and scheduler for Instagram that manages your Instagram’s marketing campaigns and content visually before pushing it live.
aiCarousels.com - The Fastest ⚡ Way to Create Social Media Carousels