Each of these options corresponds to a different software or service that can be used for aiding indexing of your newly created backlinks. Most links will get indexed eventually whenever Google (and other search engines) notices them but some users may want to ensure they are noticed more quickly by using an indexing service.
Currently No Hands SEO supports the following indexing aids:
No Hands Indexer: This is a cost effective software that is a single cost of $20 and is very easy to setup with NHSEO
No Hands Pinger: This replicates the pinging feature in NHSEO but allows you to disable the built in pinger and offload the task to a separate free tool. This will allow NHSEO to spend more time posting
BacklinksIndexer: A Pay monthly service for indexing links
Linklicious: A Pay monthly service for indexing links
Indexification: A Pay monthly service for indexing links
Lindexed: A Pay monthly service for indexing links
Simply fill in the information as required for your desired indexing software or service and save your settings for your chosen indexer(s) to be used. It is possible to use multiple services at the same time if you wish.