I use FollowLiker for IG. Been using it since last year, no complaints.
There are tons of tools out there. It really very much depends upon whether you only want to post or also do other things like comment/message/follow/like etc. Also, you need to tell us whether you want to run a handful of accounts or dozens or more (which needs proxy and mobile device control).
I would recommend you a cloud-based bot for Instagram. More specifically something based on nextpost or stackpost. (I'm a nextpost guy, because I run two servers myself, but there are many other services to choose from)For a handful of accounts it doesn't make sense to go through the hassle of installing and running desktop software or even a VPS -- better have someone that takes care of the technical side of it for very little money. (we're talking below 20$ per month)
Am I the only one who got trust issues when co-oprating with such tools?