Safarikai is described as 'Translate Japanese words on web pages. Inspired by rikaichan and rikaikun, with love for Safari' and is a Translator App in the Education & Reference category. There are more than 100 alternatives to Safarikai for a variety of platforms, including Online / Web-based, Windows, Android, iPhone and Mac. The best alternative is DeepL Translator, which is free. Other great apps like Safarikai are Google Translate (Free), Wiktionary (Free, Open Source), QuestSoft QTranslate (Free) and Tatoeba (Free, Open Source).
QTranslate is a free translator for Windows. With this small utility, you simply select the text you want to translate and then press hot key (Ctrl+Q to show translation in the popup window or Double Ctrl click to show the translation in the main window).
At its core, Tatoeba is a large database of example sentences translated into several languages. Search example sentences translated into many languages. Add and translate your own sentences. It's collaborative, open, free, and even addictive.
dict.cc is not only an online dictionary translating from English and German to 21 languages. Its an attempt to create a platform where users from all over the world can share their knowledge in the field of translations.