To name the large sized corporations
and/or the well known companies:

T-Systems, Microsoft, Logitech, Intershop,
Demandware, Interwoven, ATG, SPSS, IBM, HP,
Oracle, Google, Adobe Systems, SAP, Norcom AG,
Across Systems GmbH, RA-Micro Software GmbH,
Mindlab Solutions GmbH, webtrends, web analytics,
Mozilla, ChannelAdvisor, Heiler Software, Novell,
Cisco, F-Secure, Siemens, IBM, NCR, Wincor
Nixdorf, AVM, Toshiba, Fujitsu, TomTom, Samsung,
Netviewer, Salesforce.com, ATOSS, Actebis –
Peacock, MaxData, Ingram Micro, DNS-Softsel,
TechData, Actebis, LxPN Distributions GmbH,
MediaMarkt, Saturn,ProMarkt, Rewe, Metro, Arlt,
Euronics, PC Specialist, Interdiscount, Conrad
Electronic, Konica-Minolta, Brother, Canon,
OKI Systems, Panasonic, Epson, Perit
Consulting, Vesterling, Westhouse Consulting,
Seeburger, Siemens IT, Solutions and Services,
Bechtle, Atos Origin, OTTO Group,
immobilienscout24, mobile.de, my-hammer.de,
ebay.de, Amazon, Parship, Elite-partners, hotel.de,
s. Oliver, Polo, Montblanc, Swarovski, Deichmann,
Trigema, Jochen Schweizer, Groupon, baur,
douglas, witt-weiden, Neckermann, Tchibo direct,
conrad, medion, bonprix, expert, gourmondo,
bofrost, Autoscout24, Deutsche Bank, Commerzbank,
UBS, Credit Suisse, Deutsche Börse AG, Consors,
Unicredit, Bank AG, VISECA Card Services SA, Deka,
Investmentfonds, Allianz, quirin bank, Paysafecard.com,
wertkarten, comdirect bank, Fiducia, Geno Services,
Deutsche Postbank , R+V Versicherung,
moneybookers, paypal, Deutsche Telekom, Vodafone,
O2, Infineon, Siemens, Philips AG, Stryker Navigation,
BMW, Daimler, Volkswagen Group, Opel, Porsche,
Eberspächer, Behr GmbH & Co. KG, Mahle AG, Bosch,
EnBW, eOn, SMA Solar Technology, RWE, Vattenfall,
conergy, Lufthansa AG, FTI, Austrian Airlines, AirBerlin,
GermanWings, Tourismusverband Ostbayern, Tiscover,
Deutsche Post, Henks & Mibra Logistics Deutschland,
Springer, Gruner + Jahr, Bertelsmann, Motorpresse,
Apfel TV Kontor, Hexaglot Holding GmbH, Vogel Verlag,
Heise Verlag, IPTV.de Deutschland,
ProSiebenSat.1 Group, RTL Group, ZDF, Nintendo, Fox,
McKinsey, Accenture, Bristol group, Gopa, Dubidot,
Gauss, Emprise, Capgemini, P3 Group, Siemens IT and
Services GmbH, Bristol Group, IBM Global Services, Matrix
Technologies, empulse, solvetec IT-Services, web.de, 1&1,
T-Systems, Stratos, Alice, DMC, Elephant7, raum acht,
Pixelpark, Argonauten, Twitter, Facebook, LinkedIn, XING,
Doubleclick, SoQuero, Groupon, e-Wolff, Astramedia,
City-Guide, Click Effect Internet Marketing GmbH, Scandio,
ZANOX AG, ad pepper media, affilinet, SEDO, ADDVenture,
Tomorrow Focus, e-Consult, kuehlhaus AG.