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!
TypeSlab - Simple, shareable typographic posters
Drake Shake - Shake to add Drake to any photo
Font Candy - Font Candy lets you mask your photos with captions or simply overlay your images with text.
PicMerger - Merge photos side by side, create beautiful photo collages, customize your content with built-in photo editing tools, and more
Bold - Ultra-fast anonymous publishing platform.
Instagram Line Break - Simple clean line breaks for your Instagram captions