The Danish Portal of Slavonic Studies offers now a diachronic dictionary for Old Church Slavonic, Old Russian, Old Ukrainian and etymology. At present there are about searchable 65,000 headwords in the database.

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The search index contains following dictionaries:

[chu-eng] OCS Online - Base Form Dictionary (592)
Old Church Slavonic with infinite forms, University of Texas
[chu-eng] OCS Online - Master Glossary (1,004)
Old Church Slavonic with finite forms, University of Texas
[chu-eng] Swan's OCS Dictionary (11,503)
Swan's Old Church Slavonic Dictionary
[chu-rus] Краткий церковнославянский словарь (2,479)
С ударениями и современными буквами
[chu-rus] Краткий церковнославянский словарь Олейниковой (1,890)
Краткий словарь малопонятных слов и выражений церковнославянского языка
[chu-sla] Лексис Лаврентія Зизанія (1,084)
Лексис, Сирѣчь реченїя, Въкратъцѣ събранъны и из словенскаго языка на простый рускій діалектъ истолъкованы»; видання 1596 р.
[chu-sla] Лексис съ толкованіемъ (892)
«Лексисъ съ толкованiемъ словенскіхъ мовъ просто»; рукопис XVI ст.
[eng-chu] OCS Online - English Meaning Index (700)
English to Old Church Slavonic dictionary, University of Texas
[eng-orv] Old Russian - English Meaning Index (1,215)
English to Old Russian dictionary, University of Texas
[orv-eng] Old Russian Online - Base Form Dictionary (653)
Old Russian with infinite forms, University of Texas
[orv-eng] Old Russian Online - Master Glossary (1,178)
Old Russian with finite forms, University of Texas
[orv-rus] Lunt's Concise Dictionary of Old Russian (7,872)
11th-17th Centuries
[orv-rus] Словарь-справочник "Слово о плъку Игорєвѣ" (1,074)
АН СССР. Ин-т рус. лит. (Пушкин. Дом), 1965—1984
[rus-chu] Русско-старославянский словарь (1,229)
Russian-Old Church Slavonic Dictionary
[sla-eng] Derksen's Slavic Inherited Lexicon (2,151)
Based on Pokorny and Trubačëv
[ukr-chu] Синонїма Славеноросскаѧ (5,214)
Анонімний рукописний словник з другої пол. 17 століття ділової української мови
[rus-rus] Фасмер / Vasmer (17,309) Russian - Русский
Этимологический словарь русского языка Макса Фасмера (Vasmer)
[rus-deu-rus] Linguistische Termini (12,033)
Linguistische Termini und ihr Umfeld (deutsch-russisch, russisch-deutsch)