** Update August 2015 **
This month, Instagram removed the ability for third-party apps to send a caption to the Instagram app, I am currently working on re-doing the app... Until then youll have to manually copy/past the caption.
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Later lets you schedule posts to Instagram for later.
Spotty internet connection but want to save your photo caption? Write and save now, post Later.
Not sure which hashtags to use? Later lets you know how popular hashtags are, then what other similar hashtags people are using.
Busy and cant post right now? Just snooze the reminder and Later will let you know again soon.
Want to change where you photo was taken? Now you can easily move your photo around and find out what hashtags are popular near there.
Open source at https://github.com/adamjuhasz/Later-for-Instagram