If you are interested in trading you would probably want to learn more not only about Forex Brokers but also about Commodity Brokers. Commodity Broker is a company who executes clients orders to buy or sell commodity contracts on their behalf.
In past Commodity Brokers bought and sold grain and livestock futures contracts. Then they mainly traded derivatives based on basic commodities and primary products such as metals, gas, oil, energy and agricultural goods.
There is a great number of online Commodity Brokers. Choosing one to deal with pay attention at his reputation and learn if it is supervised by any regulatory authority (such as Commodity Futures Trading Commission and National Futures Association in US) in order to lower risks and avoid unnecessary problems.

FIBO Group
http://fibogroup.com
Works from: 1998
Country: Virgin Island British
Margin: 1:200  Spread: 2 points
Forex: 300  Forex mini: 300

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Supported language: English, Farsi, German, Russian
Demo account: unlimited
Market: CFD, Commodities, Forex, Futures, Options
Platform: MetaTrader 4
Account funding: Bank Transfer, Credit Card, WebMoney
Alpari
http://www.alpari-forex.com
Works from: 1998
Country: Russian Federation
Margin: 1:500  Spread: 2 points
Forex: 300  Forex mini: 200

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Supported language: Arabic, Chinese, English, French, Russian, Spanish
Demo account: unlimited
Market: CFD, Commodities, Forex
Platform: Alpari Direct, MetaTrader 4, MetaTrader 5, Systematic
Account funding: Bank Transfer, Credit Card, MoneyBookers, QIWI, RBKMoney, WebMoney, WIRE Transfer
Forex4you
http://www.forex4you.com
Works from: 2007
Country: Virgin Island British
Margin: 1:500  Spread: 2 points
Forex: 100  Forex mini: 2

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Supported language: Chinese, English, French, Malay, Russian, Spanish, Ukrainian
Demo account: unlimited
Market: CFD, Commodities, Forex
Platform: MetaTrader 4
Account funding: Bank Transfer, Credit Card, Liberty Reserve, MoneyBookers, RBKMoney, WebMoney, WIRE Transfer, Yandex Money
Admiral Markets
http://www.fxservice.com
Works from: 2001
Country: Russian Federation
Margin: 1:200  Spread: 2 points
Forex: 5000  Forex mini: 20

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Supported language: Bulgarian, Chinese, English, Estonian, Latvian, Lithuanian, Polish, Romanian, Russian, Ukrainian
Demo account: unlimited
Market: CFD, Commodities, Forex, Futures, Indices
Platform: MetaTrader 4
Account funding: Bank Transfer, Credit Card, Liberty Reserve, MoneyMail, Pecunix, PerfectMoney, QIWI, RBKMoney, WebMoney, WIRE Transfer
FXCompany
http://www.fxcompany.net
Works from: 2004
Country: Russian Federation
Margin: 1:500  Spread: 0.5 points
Forex: 0  Forex mini: 100

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Supported language: Chinese, English, Latvian, Polish, Russian, Ukrainian
Demo account: 30 days
Market: CFD, Commodities, Forex, Futures, Indices
Platform: MetaTrader 4
Account funding: Bank Transfer, Credit Card, Liberty Reserve, MoneyBookers, PerfectMoney, WebMoney
PFGFX Group
http://www.pfgfx.ru
Works from: 2006
Country: Russian Federation
Margin: 1:100  Spread: 3 points
Forex: 1000  Forex mini: 100

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Supported language: English, Russian
Demo account: 30 days
Market: CFD, Forex, Commodities
Platform: MetaTrader 4
Account funding: WebMoney, Bank Transfer, Credit Card, Yandex Money
Deltastock Inc.
http://www.deltastock.com
Works from: 2000
Country: Bulgaria
Margin: 1:200  Spread: 3 points
Forex: 0  Forex mini: 100

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Supported language: Bulgarian, Chinese, English, French, Romanian, Russian
Demo account: unlimited
Market: CFD, Commodities, Forex
Platform: Delta Trading
Account funding: Bank Transfer, Credit Card
MRC Markets
http://www.mrcmarkets.ru
Works from: 2002
Country: Russian Federation
Margin: 1:500  Spread: 0.5 points
Forex: 1000  Forex mini: 5

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Supported language: Chinese, English, German, Russian
Demo account: unlimited
Market: CFD, Commodities, Forex, Indices
Platform: MetaTrader 4
Account funding: Bank Transfer, WebMoney
Swiss Global
http://www.swissfs.com
Works from: 2007
Country: Switzerland
Margin: 1:100  Spread: 3 points
Forex: 5000  Forex mini: 50

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Supported language: English
Demo account: unlimited
Market: Forex, Options, Futures, CFD, Commodities
Platform: MetaTrader 4
Account funding: Bank Transfer, WIRE Transfer
InstaForex
http://instaforex.com
Works from: 2007
Country: Russian Federation
Margin: 1:500  Spread: 3 points
Forex: 1  Forex mini: 0

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Supported language: English, Russian, Chinese, German, Italian, French, Turkish, Portuguese, Latvian, Indonesian, Thai, Czech
Demo account: unlimited
Market: CFD, Forex, Commodities
Platform: MetaTrader 4
Account funding: WebMoney, E-Gold, Bank Transfer
BroCo
http://www.brocompany.com
Works from: 2008
Country: Russian Federation
Margin: 1:200  Spread: 2 points
Forex: 1000  Forex mini: 0

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Supported language: Chinese, English, Russian, Spanish, Ukrainian
Demo account: unlimited
Market: CFD, Commodities, Forex, Futures, Indices
Platform: Alfa-Direkt, Currenex, Laser Trade, MetaTrader 4, Quik, Strategy Runner, TradEX, VolFix
Account funding: Bank Transfer, MoneyBookers, WebMoney, Yandex Money