Somewhere to practice verb conjugation. It's free and customisable.

It's just a flashcard, with multiple choice options, but you can change to typing them in. You can select a single tense, or groups of tenses grouped around beginner, intermediate or advanced, or all tenses (see settings).

It's a fun and easy way to test your conjugation for verbs you're not yet familiar with or don't use often.

https://maestrospanish.com/

I have found it useful (although I'm only in present tense for now). So thought that I'd share.