OpenType Std
Ideally, text fonts in the OpenType Std category contain an extended Latin character set.
This character set supports the following 21 languages: Afrikaans, Basque, Breton, Catalan, Danish, Dutch, English, Finnish, French, Gaelic (Irish, Scots), German, Icelandic, Indonesian, Irish, Italian, Norwegian, Portuguese, Saami (Southern), Spanish, Swahili, Swedish.

In individual cases, further non-Latin languages and typographical character variants may be included in these fonts. In some cases headline or fun fonts may not support all the languages listed above.

OpenType Pro
In addition to the characters supported in the "Std" version, OpenType Pro fonts contain characters for the following 12 European languages: Croatian, Czech, Estonian, Hungarian, Latvian, Lithuanian, Polish, Romanian, Serbian, Slovak, Slovenian, Turkish

Some of the fonts in the OpenType Pro category contain additional typographical character variants.

OpenType Com
This standard contains 387 characters and it guarantees tha 48 languages can be supported be every OpenType Com font. Here is a full list of languages: Afrikaans, Albanian, Basque, Bosnian, Breton, Catalan, Cornish, Croatian, Czech, Danish, Dutch, English, Estonian, Faroese, Finnish, French, Frisian, Friulian, Gaelic/Irish, Gaelic/Manx, Gaelic/Scots, Gagauz (Latin), Galician, German, Hungarian, Icelandic, Indonesian, Irish, Italian, Karelian, Ladin, Latvian, Lithuanian, Maltese, Moldavian (Latin), Norwegian, Polish, Portuguese, Rheto-Romance, Romanian, Saami, Serbian, Slovak, Slovenian, Sorbian, Spanish, Swahili, Swedish, Turkish, Turkmen/Latin.

These fonts may also include further languages and typefaces specific typographical character variants.

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Further reference
OpenType Overview
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