Aranea is a family of comparable web corpora prepared by Vladimír Benko. See more here.
Benko, V.: Aranea - comparable web corpora. Ústav Českého národního korpusu FF UK, Praha 2015. Available on-line: <http://www.korpus.cz>.
Benko, V. (2014): Aranea: Yet Another Family of (Comparable) Web Corpora. In: Sojka, P. – Horák, A. – Kopeček, I. – Pala, K. (eds): TSD 2014, LNAI 8655, 257–264. Springer International Publishing. (PDF to download)