Japanese study related:
- Jeffrey’s Japanese⇔English Dictionary Server (my primary J<>E dictionary)
- Handwritten kanji search (awkward mouse writing and predictive searching; links to a very nice kanji dictionary)
- Weblio Kobun (classical Japanese dictionary; incomplete but useful)
- Yahoo Japan (a decent aggregator that gives you results from multiple dictionaries)
- Kotowaza Allguide (note also lookups for 四字熟語 linked at the bottom)
- Kotowaza Classroom (apparently geared toward children/learners)
- Jitenon Yojijukugo (also with links to kanji and kotowaza resources)
- Kakijun (proper stroke order for writing; also a simple kanji dictionary)
- Iroha Karuta (the three major iroha karuta sets)
Hebrew study related:
- Pealim verb table lookup (verb tables; wheeeee! Also adjectives)
- Morfix dictionary (E<>H)
Gaming related:
- The Alexandrian (top-notch theory, mostly with practical applications for GMs)
- A Book of Creatures (all the cryptids your bestiary could ever need)
- Dungeon Fantastic (mostly GURPS, but also a lot of insights into megadungeon design and game balance/tactics)
- Dyson Logos (the mapmaker)
- Trilemma Adventures (high-quality two-page dungeons in an isometric style)
and
- An online dice-roller tool from WOTC