EXHIBIT 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM The Board of Directors and Stockholders Clarus Corporation We consent to the incorporation by reference in the registration statements on Form S-8 (Registration Nos. 333-42600, 333-42602, 333-42604, 333-42606, 333-59193 and 333-71838) and on Form S-3 (Registration No. 333-90077) of Clarus Corporation of our reports dated March 14, 2005, with respect to the consolidated balance sheets of Clarus Corporation and subsidiaries as of December 31, 2004 and 2003, and the related consolidated statements of operations, stockholders' equity and comprehensive loss, and cash flows for each of the years in the three-year period ended December 31, 2004, and the related financial statement schedule, management's assessment of the effectiveness of internal control over financial reporting as of December 31, 2004 and the effectiveness of internal control over financial reporting as of December 31, 2004, which reports appear in the December 31, 2004 annual report on Form 10-K of Clarus Corporation. /s/ KPMG LLP Stamford, Connecticut March 14, 2005