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!
Drake Captions - Find the perfect Drake lyric for your Instagram caption
Drake Shake - Shake to add Drake to any photo
PicMerger - Merge photos side by side, create beautiful photo collages, customize your content with built-in photo editing tools, and more
Pretty Captions - Create beautiful captions for Instagram and other platforms
Instagram Line Break - Simple clean line breaks for your Instagram captions
Totems - Advanced social analytics platform for Instagram