| X | 28 | 53 |
| X File Explorer Project | 1 | 1 |
| X Multimedia System | 1 | 2 |
| X-Cd-Roast | 1 | 1 |
| X-Data-Spreadsheet Project | 1 | 1 |
| X-Dev | 1 | 2 |
| X-Diesel | 1 | 5 |
| X-Doom | 1 | 2 |
| X-Ice | 1 | 1 |
| X-Iweb.Ru | 1 | 1 |
| X-Man Project | 1 | 1 |
| X-Micro | 1 | 2 |
| X-Plane | 1 | 2 |
| X-Script | 1 | 1 |
| X-Scripts | 2 | 13 |
| X-Ways Software Technology Ag | 1 | 1 |
| X-Wrt | 1 | 1 |
| X.Org | 31 | 183 |
| X10Media | 5 | 6 |
| X11Vnc Project | 1 | 1 |
| X2 Studios | 1 | 1 |
| X26-Cogs Project | 1 | 1 |
| X2Crm | 1 | 2 |
| X2Engine | 2 | 13 |
| X2Go | 1 | 2 |
| X3Cms | 1 | 3 |
| X7 Group | 1 | 8 |
| X7Chat | 1 | 1 |
| Xaaaaav38 | 1 | 1 |
| Xabber | 1 | 1 |
| Xack | 1 | 1 |
| Xajax | 1 | 2 |
| Xajax-Project | 1 | 1 |
| Xakuro | 2 | 2 |
| Xalpha Project | 1 | 1 |
| Xampp | 1 | 5 |
| Xander Ladage | 1 | 1 |
| Xangati | 2 | 4 |
| Xantech | 1 | 3 |
| Xaos | 1 | 1 |
| Xapian | 2 | 2 |
| Xar Project | 1 | 2 |
| Xaran | 1 | 1 |
| Xaraya | 1 | 3 |
| Xarrow | 1 | 7 |
| Xastir | 1 | 1 |
| Xataface Project | 1 | 1 |
| Xatrix | 1 | 1 |
| Xavi | 1 | 2 |
| Xavier Ducrohet | 1 | 1 |
| Xaviershay-Dm-Rails Porject | 1 | 1 |
| Xavoc | 1 | 1 |
| Xayr | 1 | 1 |
| Xbiff2 | 1 | 1 |
| Xbifrost | 1 | 2 |
| Xblockout | 1 | 2 |
| Xbmc | 1 | 1 |
| Xboing | 1 | 1 |
| Xbornid | 1 | 1 |
| Xbrite | 1 | 1 |
| Xbtitracker Project | 1 | 1 |
| Xcache Technologies | 1 | 1 |
| Xcat Project | 1 | 1 |
| Xcb Project | 1 | 5 |
| Xceedium | 1 | 6 |
| Xcent | 1 | 1 |
| Xcfa Project | 1 | 2 |
| Xcftools Project | 1 | 2 |
| Xchangeboard | 1 | 3 |
| Xchat | 2 | 13 |
| Xchat-Wdk | 1 | 1 |
| Xcloner | 1 | 14 |
| Xclusive-Software | 1 | 1 |
| Xcmail | 1 | 1 |
| Xcms | 1 | 3 |
| Xcomputer | 1 | 1 |
| Xcritical.Software | 1 | 1 |
| Xd-Testing Project | 1 | 1 |
| Xda-Developers | 1 | 1 |
| Xdelta | 1 | 1 |
| Xdforum | 1 | 1 |
| Xdmod | 1 | 1 |
| Xdsoft | 2 | 2 |
| Xecms | 1 | 1 |
| Xecms Project | 1 | 1 |
| Xeforum | 1 | 1 |
| Xelerance | 1 | 16 |
| Xelex | 1 | 2 |
| Xemacs | 1 | 2 |
| Xen | 5 | 468 |
| Xen Carousel Plugin Project | 1 | 1 |
| Xen-Orchestra | 2 | 2 |
| Xenforo | 1 | 3 |
| Xenis | 1 | 4 |
| Xennobb | 1 | 4 |
| Xenomtechnologies | 1 | 1 |
| Xensource | 2 | 4 |
| Xensource Inc | 1 | 6 |
| Xentraz | 1 | 2 |
| Xenu By | 1 | 1 |
