Scrybe is a free third-party Android keyboard that uses Google Scribe to generate suggestions, developed using an unofficial Google Scribe API.
Howerver, Scrybe has many issues that's need to be fixed, such as: if you delete some letters from word, Scrybe isn't able to detect that you're not writing a new word. Another problem is that you can't type very fast because Scrybe tries to fetch the suggestions.
Some Reddit users think that SwiftKey has a better approach: it preloads the data, so there's no lag. "So this's basically the same thing as SwiftKey, but offloaded to Google's servers? Seems to work well, but no better (and slower) than SwiftKey," says Podspi.
SwiftKey is $3.99 and there's a two-week trial.