Company Kateryna Osichniuk created these great apps:
French articles & vocabulary, French verbs with Verb Chick, Spanish verbs with Verb Chick, Learn English grammar: Articles, Learn English grammar: Much, many, little, few, Learn English grammar: Some, any & their compounds, Learn English grammar: Modal verbs, Learn English grammar: Prepositions at, in, on, Learn 100 French verbs, Learn 100 Spanish verbs, Learn 100 Irregular Verbs, and others..
