I've been using PostBuilder (used to be called gramspacer) for several months now and I use it almost every single work day. PostBuilder makes it super convenient for organizing and planning content for my Instagram pages and the founder is very responsive if you have questions or if there's ever an issue. I definitely recommend them!
Caption - Open-source captioning tool to help find the right subtitles.
Drake Shake - Shake to add Drake to any photo
Ava - Making conversations accessible for the deaf
PicMerger - Merge photos side by side, create beautiful photo collages, customize your content with built-in photo editing tools, and more
Captioned - Say, show, share. Create a 60 second captioned video.
Instagram Line Break - Simple clean line breaks for your Instagram captions