Original Post
Just wanted to share the link to https://software.intel.com/en-us/articles/adaptive-screen-space-ambient-occlusion / https://github.com/GameTechDev/ASSAO if anyone's interested.
It's in quality similar to HBAO+ (the core is based on horizon based ambient occlusion) but has lower (and higher) quality/performance presets, so it's easy to tune for lower/higher power hardware. For example, the "Low" preset is suitable for use on newer integrated graphics on laptops.
Current implementation is DX11-only but it's completely opensource (MIT license) so you can use it, port it and tweak it in any way you like :)