What are some alternatives?
When comparing Sharethrough and Index Exchange, you can also consider the following products
StackAdapt - Native advertising demand side platform.
LiveRail - LiveRail, a Facebook company, is a monetization platform for publishers, broadcasters, and mobile app developers.
Nativo - Nativo is an advertising technology platform for brand advertisers and publishers to scale, automate, and measure native ads
AdStir - AdStir is an SSP providing value to the publishers through the fulfillment of ad formats and multi-device correspondence.
Adobe Advertising Cloud - Adobe Advertising Cloud is ads providing a platform that lets your media-related thing to lift on the high note.
AppNexus Publisher SSP - AppNexus Publisher SSP provides advanced controls to manage your demand partners across desktop, mobile, native, and video.