- Database Designs
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- Database Systems Corp
- Database Technologies Inc
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- Datakey Electronics Inc
- Datalink Corp
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- Datametrics Software Syst LLC
- Datamill Business Systems Inc
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- Dave Lain Network
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- Debug It LLC
- Decagon Corp
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- Decision Support Technology
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- Decision Ware
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- Demand Data
- Demand Management Inc
- Denali Advanced Intergration
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- Denali Software Inc
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- Dennis Jones & Assoc
- Dentisoft Technologies Inc
- Denysys Corp
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- Design Automation Inc
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- Design Science Inc
- Design Science Inc
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- Dialog Corp
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- Diamond Software Group Inc
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- Digi Terra Inc Group
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- Digital Content LLC
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- Dinkumware Limited
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- Docsite LLC
- Docsoft
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- Docucorp International Inc
- Document Imaging Solutions
- Document Sciences Corp
- Document Sciences Corp
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- Documentum