JWPce is described as 'free Japanese <--> English dictionary and word processor created by Glenn Rosenthal' and is an app in the Education & Reference category. There are six alternatives to JWPce for Windows, Online / Web-based, Mac and Linux. The best alternative is Tagaini jisho, which is both free and Open Source. Other great apps like JWPce are Jisho (Free), zkanji (Free, Open Source), JWPxp (Free, Open Source) and WaKan (Free).
RomajiDesu is a free online bi-directional Japanese-English dictionary, Kanji dictionary, Sentence analyzer and Japanese to Romaji/English translator, and Romaji to Hiragana/Katakana Converters for Japanese learners.