| X Engineering Software Systems Corp | 1 | www.xess.com/index.php | UNITED STATES |
| Xactware Solutions Inc. | 1 | https://www.xactware.com | UNITED STATES |
| Xandros Inc. | 1 | www.xandros.com | UNITED STATES |
| Xara Ltd. | 9 | www.xara.com | UNITED KINGDOM |
| Xarios Ltd | 2 | www.xarios.com/uk/ | UNITED KINGDOM |
| XboxMB | 1 | www.xboxmb.com/horizon/ | UNITED STATES |
| Xceed Software Inc. | 2 | www.xceedsoft.com | CANADA |
| Xcitex Inc. | 2 | www.xcitex.com/ | UNITED STATES |
| Xdrive Inc. | 1 | www.xdrive.com/ | UNITED STATES |
| Xelerate Software Inc. | 1 | www.xelerate.biz | UNKNOWN |
| Xeltek Inc. | 1 | www.xeltek.com/home.php | UNITED STATES |
| XEmacs Development Team | 1 | www.xemacs.org/ | UNKNOWN |
| XemiComputers | 5 | www.xemico.com/ | CYPRUS |
| XEN Soft | 1 | www.xensoft.de | GERMANY |
| Xenetech | 1 | https://www.xenetech.com/ | UNITED STATES |
| XenoDream Software LLC | 1 | www.xenodream.com/ | UNITED STATES |
| Xensam AB | 1 | https://www.xensam.com | SWEDEN |
| XenSource Inc. | 1 | | UNITED STATES |
| Xequte Software | 3 | www.xequte.com/ | NEW ZEALAND |
| Xerox Corporation | 23 | www.xerox.com | UNITED STATES |
| Xesc & Technology | 1 | xviservicethief.sourceforge.net/ | UNKNOWN |
| Xfire Inc. | 1 | www.xfire.com | UNITED STATES |
| xFX JumpStart | 2 | www.xfx.net/ | UNKNOWN |
| Xi Software | 1 | www.xi-soft.com/default.htm | UNITED STATES |
| xiles | 1 | www.xiles.net/ | KOREA, DEMOCRATIC PEOPLE'S REPUBLIC OF |
| Xilinx Inc. | 4 | www.xilinx.com/ | UNITED STATES |
| Xilisoft | 3 | www.xilisoft.com | UNITED STATES |
| Xillvideo Software Inc. | 1 | www.xillvideo.com/index.htm | UNITED STATES |
| XIMETA Inc. | 1 | www.ximeta.com/web/ | UNITED STATES |
| Xing Technology Corp. | 23 | www.xingtech.com | UNITED STATES |
| Xingtone | 1 | www.xingtone.com/ | UNITED KINGDOM |
| Xinox Software | 2 | www.jcreator.com | NETHERLANDS |
| Xiotech Corporation | 1 | xiostorage.com/ | UNITED STATES |
| Xircom | 2 | www.xircom.com | UNITED STATES |
| Xirrus Inc. | 1 | www.xirrus.com/ | UNITED STATES |
| XJTAG | 1 | https://www.xjtag.com | UNITED KINGDOM |
| XK72 Ltd | 1 | www.xk72.com | UNKNOWN |
| XL Consulting GmbH | 1 | https://www.synkronizer.com/ | SWITZERLAND |
| XLCubed | 1 | https://www.xlcubed.com | UNITED KINGDOM |
| XLink Technology | 2 | www.xlink.com/index.aspx | UNITED STATES |
| XLnow | 1 | www.onscript.com/en/home.asp | SWITZERLAND |
| XM Tools Ltd. | 1 | xmtools.com/ | UNITED KINGDOM |
| Xmarks Inc. | 1 | www.xmarks.com/about/company | UNITED STATES |
| XMedia Recode | 1 | www.xmedia-recode.de/index.html | UNKNOWN |
| XMind LTD | 2 | www.xmind.net | HONG KONG |
| xml-buddy.com | 1 | https://www.xml-buddy.com | AUSTRIA |
| XnSoft | 1 | www.xnview.com/ | FRANCE |
| XnView | 1 | https://www.xnview.com | FRANCE |
| Xobni Corporation | 1 | www.xobni.com/ | UNITED STATES |
| XoloX B.V. | 1 | | NETHERLANDS |
| XOR Corp. | 1 | www.xor.com | UNITED STATES |
| Xoreax Ltd. | 1 | www.xoreax.com/ | ISRAEL |
| XP Software Inc. | 1 | www.xpsoftware.com | UNITED STATES |
| XPTools | 1 | www.xptools.net/ | UNKNOWN |
| xpy | 1 | code.google.com/p/xpy/ | UNKNOWN |
| XRayz Software | 2 | www.xrayz.co.uk/ | UNITED KINGDOM |
| xrecode | 1 | xrecode.com/ | UNKNOWN |
| X-Rite Inc. | 5 | www.xrite.com | UNITED STATES |
| XRT-CERG Finance SA | 1 | www.xrtcerg.com/Default.htm | FRANCE |
| XSpace | 1 | www.xsoft.ro/ | ROMANIA |
| XStream Software Inc. | 1 | www.xstreamsoftware.com/ | CANADA |
| Xteq Systems | 2 | www.xteq.com | UNITED STATES |
| xThink Inc. | 1 | www.xthink.com/ | UNITED STATES |
| XTools Pro Inc. | 1 | https://xtools.pro/ | UNITED STATES |
| Xtrakter Ltd | 1 | www.xtrakter.com | UNITED KINGDOM |
| Xtreeme GmbH | 2 | www.xtreeme.com/ | SWITZERLAND |
| XTS Software Corp. | 1 | www.axiumae.com/Home.aspx | UNITED STATES |
| Xupiter.com | 1 | | SHAREWARE PRODUCT |
| XviD | 1 | www.xvid.org/ | UNKNOWN |
| X-Ways AG | 1 | www.x-ways.com | GERMANY |
