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Following.

Buffer is good.

Buffer/Hootsuite/OneUp all work I think the determinator for you may be how many posts you want to schedule in advance. Most allow up to 10 posts in advance on their free plans - much more (varies how much) on their paid plans.

Shield is a good one too

Create another personal Hootsuite account and schedule from there?

Not free but I am liking social pilot a lot for posting.