Check here to see which plug-ins are compatible with the Pro Tools AAX plug-in format. This is a free database that was started when Pro Tools 11 was launched and many plug-ins were not compatible with the 64 bit AAX format. This database is fully searchable, for example you can choose to find just AAX DSP or AAX native plug-ins, or search by software developer.
You might also want to check our FAQ section about Pro Tools it includes common questions such as;
Check Pro Tools AAX plug-in compatibilty with our free AAX plug-in database for Pro Tools users. It aims to give up-to-date information on third-party vendor support for the Pro Tools AAX plug-in format (both 32-bit for PT 10 and 64-bit for Pro Tools 11).
It is a community-based project; no warranty is implied or given. Please check compatibilty with your Pro Tools system before purchasing any plug-in. E&OE.