Lexicum is described as 'tool that helps you expand your foreign language vocabulary by providing exercises and vocabulary-based social exchange. It helps both learners attending a language class, and experienced speakers that casually encounter a new word' and is a language learning tool in the education & reference category. There are more than 50 alternatives to Lexicum for a variety of platforms, including Android, iPhone, Online / Web-based, iPad and Android Tablet. The best alternative is Anki, which is both free and Open Source. Other great apps like Lexicum are Duolingo, Memrise, RemNote and Quizlet.
Anki is a program which makes remembering things easy. Because it is a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.
Have fun while learning a foreign language with Memrise. The more you enjoy learning, the more (and quicker) your skills will develop. This is why entertainment mixed with real-life, relevant content is at the very core of the Memrise language learning experience.
RemNote is the note-taking tool that gives you memory superpowers. It automatically generates flashcards from your notes and figures out the optimal time to practice each flashcard so you don't forget what you've learned.