Tools
Quick character reference: Ç ç Ş ş ğ ı İ Ö ö Ü ü Â â Î î Û û
Type Turkish Characters is an online Turkish keyboard.
Google Translate barfs when fed Ottoman Turkish, but it can be useful for translating Ottoman Turkish-to-modern-Turkish dictionaries. The Listen function will pronounce words whether or not the dictionary knows the word.
Dictionaries
Redhouse’s Turkish Dictionary, 1880. The Google Books version is moderately searchable.
www.ingilizceosmanlica.com is an Ottoman-to-English dictionary based on an earlier work. The site’s search engine stinks. The best way to search the site is to Google for site:www.ingilizceosmanlica.com [Turkish word].
Institutionum linguæ turcicæ, a Turkish-Latin dictionary by Hieronymus Megiser, 1612
Sesli Sozluk is a modern dictionary that sometimes has Ottoman Turkish-to-modern Turkish definitions toward the bottom of the page.
Tarama Sözlüğü is a scholarly Ottoman Turkish dictionary that not only defines words, it presents instances of usage back to at least the 16th century.
Grammars
A simplified grammar of the Ottoman-Turkish language by Sir James Redhouse, 1884.
Ottoman-Turkish conversation-grammar; a practical method of learning the Ottoman-Turkish language, by Hagopian, V. H., 1907.
Rudimenta grammatices linguæ turcicæ, by André Du Ryer, 1633. One of the earliest Turkish grammars by a European, but you have to know Latin to use it.