Tilde is a good resource for terminology look up, it can be integrated to OmegaT, Wordfast Anywhere or SDL Trados (three most used CAT software/platform). It only supports 25 languages in Europe.
Free for 250 terms per day:
Language and Domain Coverage
Tilde Terminology searches through millions of terms in various sources,
including trusted EuroTermBank and IATE terms.
Bulgarian Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hungarian Irish Italian Latvian Lithuanian Maltese Polish Portuguese Romanian Russian Slovak Slovene Spanish Swedish Turkish
Source: Tilde Terminology