Construction Tools Atlas (建設・現場用語辞典) Construction site glossary in JA/EN. Fast search.
Kanji Modernizer – Old New Kanji Convert Convert old Japanese kanji (Kyūjitai) to modern forms.
UnitMaster — Global Unit Converter Convert 40+ units instantly. Simple, fast, and mobile-first.
LogFormatter – 地味ログ整形屋 Beautify long logs instantly. Fast, private, browser-based.