The only certifications that immediately come to mind that may increase market value are Cisco certifications. That's for computer networking rather than software dev. Otherwise I don't put much stock in certs.
Another in the corporate IT world would be certification in one of the major CRM or ERP applications like SalesForce, Oracle NetSuite or SAP. These aren't technically programming either but certification can lead to commanding big money for those who are willing to travel frequently and have a way of convincing clients to hand over a lot of cash.
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