Convio, which provides integrated software solutions to 1,300 nonprofit organizations to assist with fundraising and relationship management capabilities, filed on Monday with the SEC to raise up to $58 million in an initial public offering. The Austin, TX-based company, which was founded in 1999 and booked $63 million in sales over the last 12 months, previously filed to go public in August of 2007 to raise up to $86 million but withdrew the deal in August of the following year. The nonprofit focused technology company is backed by VC firms including Granite Ventures (20%) and Austin Ventures (16%). Convio plans to list on the NASDAQ under the symbol CNVO and use net proceeds for working capital and to repay a portion of their oustanding debt. Thomas Weisel and Piper Jaffray are the lead underwriters on the deal, for which pricing terms and timing were not disclosed.