Any Hot Programs For Blacberry curve 8520??????????

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i have a blackberry cure 8520 and i want some really cool programs for it i want free ones. i basicly want something like im+ but better and i dont have the blackberry service i had it for a month then quit i hoped it will work over wifi the msn messenger but it didn't nor did the blackberry messenger so i hope you can help me out guys and thank you.