External BLOB Storage (EBS) – Third-party EBS Provider Vendors

•  DocAve Extender – Free (AvePoint)
• SharePoint File Share Library (Bamboo)
• Archiving Express for SharePoint (Metalogix)
• Simpana Archive for SharePoint (Commvault)
• StorageEdge (Alachisoft)

 Remote BLOB Storage (RBS) – Third-party RBS Provider Vendors

• EMC Centera RBS (EMC)
• DocAve Extender – Free (AvePoint)
• SnapManager (NetApp)
• ECM Suite for SharePoint (Open Text)
• Simpana Archive for SharePoint (Commvault)
• StoragePoint (Metalogix)
• NCachePoint 2.0 (Alachisoft)

More info:

• About Remote BLOB Store Provider Library Implementation Specification
• RBS Team's Blog
• RBS Samples

This is not an exhaustive list of products and vendors, if you have other suggestions, please send me an e-mail.