In reply to Richard.

TranslatePress has a similar interface with Weglot and is not a SaaS. So no more page limits or word limits. The limits do come however with the number of languages, so you'll need a pro version if you want to translate in more then two.

It also has support for some advanced features like gettext fields (if they exist they get populated) and ajax loaded strings out of the box if you have a more complex site. https://wordpress.org/plugins/translatepress-multilingual/