Here is the list of manufacturers of Aluminum electrolytic capacitors, tantalum electrolytic capacitors (both solid tatalum and non-solid tantalum), ceramic capacitors, various film capacitors. This list is based on linecards of electronics component manufacturers, and distributors, as of 2010.

Aerovox Div. PPC (http://www.aerovox.com/)
American Capacitor Corp (http://www.americancapacitor.com/)
Arcotronics (http://www.arcotronics.us/)
American Technical Ceramics (http://www.atceramics.com/)
AVX Corp. (http://www.avxcorp.com/)
Barker Microfarads, Inc. BMI (http://www.bmicaps.com/)
Cornell Dubilier (http://www.cde.com/)
DuraCap International Inc. (http://www.duracap.com/)
Electronic Concepts Inc (http://www.eci-capacitors.com/)
EPCOS (http://www.epcos.com/)
Evans Capacitor Company (http://www.evanscap.com/)
Evox Rifa (http://www.evox-rifa.com/)
Electronic Film Capacitors Inc. (http://www.filmcapacitors.com/)
Illinois Capacitor (http://www.illcap.com/)
Johanson Dielectrics (http://www.johanson-caps.com/)
Kemet (http://www.kemet.com/)
KOA Speer (http://www.koaspeer.com/)
muRata (http://www.murata.com/)
Nichicon (http://www.nichicon-us.com/)
Novacap (http://www.novacap.com/)
Panasonic Industrial Components (http://www.industrial.panasonic.com/)
ROHM Semiconductors (http://www.rohmelectronics.com/)
Taiyo Yuden (http://www.t-yuden.com/)
Vishay (http://www.vishay.com/)
United Chemi-Con (http://www.chemi-con.com/)
Wima (http://www.wima.com/)
Yageo (http://www.yageo.com/)