1) Open Cydia
2) Manage
3) Sources
5) Edit
6) Add
7) Type the URL and tap Add Source
See below for a video on how to use these. Would you like to see your repository added here? Send us the URL.
Top 15 Cydia Sources
- Big Boss http://apt.thebigboss.org/repofiles/cydia/ (Update: BigBoss is having server issues right now due to huge demand. Will be back up once traffic dies down. Details from BigBoss on Twiter)
 - Sinful iPhone http://sinfuliphonerepo.com
 - BiteYourApple http://repo.biteyourapple.net
 - Insanelyi http://repo.insanelyi.com
 - HackStor repo http://cydia.myrepospace.com/Hackstore/
 - HackYouriPhone http://repo.hackyouriphone.org
 - Hackulous http://cydia.hackulo.us/
 - xSellize http://cydia.xsellize.com
 - iHacks http://ihacksrepo.com
 - Rip Dev http://i.ripdev.com
 - ModMyi: http://apt.modmyi.com
 - iExploit: http://iexploit.myrepospace.com/
 - Pwn Centre http://apt.pwncentre.com
 - iCauseFX http://repo.icausefx.com/
 - Cydia Developer and Java Run Time: http://apptapp.saurik.com
 
Popular Cydia Sources
- SAM to unlock your iPhone http://repo.bingner.com (details)
 - Ultrasn0w for iPhone 3G/3GS in Cydia http://repo666.ultrasn0w.com/
 - Purplesn0w for iPhone 3G/3GS in Cydia apt.geohot.com
 - BootLace: http://repo.neonkoala.co.uk
 - iSpazio: http://repo.ispazio.net
 - Smxy.org Ste Packaging http://repo.smxy.org/installer4/
 - intelliborn http://intelliborn.com/repo/
 - Theme It App: http://www.themeitapp.com/repo/
 - P0dulo (down) http://p0dulo.com
 - iClarified (down) http://cydia.iclarified.com/
 - French Repo: http://cydiasystem.com
 
Additional Sources
- xWaves xGPS: http://cydia.xwaves.net/
 - TouchRepo: http://touchrepo.com/repo.xml
 - Pushfix: http://cydia.pushfix.info/
 - HighTymes: http://hightymes.org/iphone/plist/index.xml
 - twenty08 (MobileChat): http://twenty08.com/installer
 - iSwitcher: http://meachware.com/list.xml
 - AirVideoEnabler: http://cydia.zone-mr.net
 - AlohaSoft 1.0.2: http://homepage.mac.com/reinholdpenner/102.xml
 - AlohaSoft 1.1.1: http://homepage.mac.com/reinholdpenner/111.xml
 - AlohaSoft 1.1.2: http://homepage.mac.com/reinholdpenner/112.xml
 - Apogee LTD: http://apogeeltd.com
 - Asuraku’s Repo: http://asuraku.googlepages.com/repo.xml
 - aXP: http://lostsoul.aeroxp.org/iphone/index.xml
 - Blaze Ultimate: http://blazecompany.googlepages.com/blaze.xml
 - CedSoft: http://prog.cedsoft.free.fr
 - Chinese LumaQQ: http://lumaqq.linuxsir.org/update/repository.plist
 - CopyCoders: http://homepage.mac.com/hartsteins/copycoders/copycoders.xml
 - Danstaface vWallpaper from Skrew: http://deb.danstaface.net
 - Death to Design: http://iphone.deathtodesign.com/index.xml
 - Demosthenes705′s eBooks: http://chriss.brandonsgames.com/index.xml
 - iApp-a-Day: http://iappaday.com/install
 - iBlackJack: http://iphonefanclub.com/native
 - Imagine09: http://home.twcny.rr.com/imagine09/Imagine09.xml
 - Indonesian Repo: http://repo.indo.net.id/mci.xml
 - Internet Plug-In: http://brandonschlenker.com/plugin.xml
 - iPhone Apps: http://repo.us.to or applerepo.a.la
 - iPhone DevDocs: http://idevdocs.com/install
 - iSolitaire: http://iphone.rustyredwagon.com/repo
 - iUnlock: http://i.unlock.no
 - Limited Edition iPhone: http://limitededitioniphone.com/lei.xml
 - Mateo: http://bblk.net/iphone
 - MobileStacks: http://mobilestack.googlecode.com/svn/repository/internal.plist
 - Moyashi’s Stuff: http://hpcgi3.nifty.com/moyashi/ipodtouch/repository.cgi
 - MTL Repository: http://home.mike.tl/iphone
 - Nuclear Design: http://nucleardesign.net/repository
 - Patricks Source: http://sources.st3alth.org/sources.xml
 - Pyrofer’s Projects: http://pyrofersprojects.com/repos/repos.xml
 - PXL Repository: http://pxl.freemyiphone.com
 - R4m0n Repository: http://iphone.r4m0n.net/repos
 - Robota International: http://iphone.robota.nl
 - Scientific Calcs: http://tinyurl.com/2b32sn
 - ScummVM: http://urbanfanatics.com/scummvm.xml
 - Shai’s Repo: http://ride4.org/shai.xml
 - Simek’s Graphic: http://simek.ddl2.pl
 - Studded: http://studded.net/installer/index.xml
 - Surge: http://iphonesurge.com/iphonesurge.xml
 - Swell: http://lyndellwiggins.com/installer/Swell
 - weTools: http://app.weiphone.com/installer
 - PBF: http://www.polarbearfarm.com/repo/
 - iFob: http://www.icloseby.com/downloads/iFob.pxl
 - newattiphone: http://www.newattiphone.com/repo.xml
 - byooi.com digicide: http://byooi.com/iphone/digicide.plist
 - Maomaland Themes: http://maomaland.com/iphone/repo.xml
 - Apple Daily Times: http://appledailytimes.com/installer
 - apt.dotaart.com http://apt.dotaart.com/
 - Conceited Software: http://conceitedsoftware.com/iphone
 - Conceited Software Beta: http://conceitedsoftware.com/iphone/beta
 - AppTapp Official: (discontinued) http://repository.apptapp.com
 - BeYourIP (discontinued) http://repo.beyouriphone.com/
 - Ste Packaging: (discontinued) http://repo.smxy.org/iphone-apps/
 - Sleepers: (discontinued) http://sleepers.net/iphonerepo
 
Languages
- Arabic: http://apps.iphoneislam.com
 - Simplified Chinese: http://iphone.org.hk/repository.plist
 - Chinese: http://iphone.freecoder.org/rep/
 - Danish: http://iphone.vildmedmac.dk/install
 - FrenchIphone: http://rep.frenchiphone.com
 - Greek: http://greek-iphone.com/grloc
 - Hebrew: http://ihebrew.net
 - Hebrew: http://repo.hebrew4iphone.com/
 - iPhone for Taiwan: http://iphone4.tw/unlock/
 - Korean: http://bomijoa.com/iphone / agaat.info/demo
 - Norwegian http://iFon: install.ifon.no
 - Polish iPolish: http://wakoman.ovh.org/iphone
 - Portugues-Brasil(1.1.2): http://iphonemod.com.br/forum/repo/installer.xml
 - Russian iPhone: http://russianiphone.ru/beta
 - Russian Tools (in English): http://russianiphone.ru/beta/en
 - Spanish Phyros iPhone-ES: http://iphone.frickr.es/index.xml
 - Swedish iFun.se: http://ifun.se/swe
 - Taiwanese: http://iphone4.tw/unlock
 - Vietnamese: http://iphone.billydragon.net