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I'm not the original commenter, but I just started using cryfs in Dropbox and it's working very well: https://github.com/cryfs/cryfs

KDE plasma has just started incorporating this into their desktop as a product called 'Vaults'.

I have been using Software called BoxCryptor for many years. Quite convenient.

Containers lime VeraCrypt would be quite inconvenient, but work if you don’t make changes on many computers at the same time.

Dropbox only syncs the difference of the encrypted files. Truecrypt uses by default AES which encrypts blocks of size 256kb. It's almost as efficient as syncing without encryption.

I am very happy with cryptomator.org

It's open source.