Bittorent sync (installation file and instructions available on their website) - because it lets you use your “my cloud” in same way as dropbox etc.
Transmission - because after data backup always online file downloading is fantastic.
Wordpress - because being able to host your own blog is always a bonus.
My top three most wanted / unsure if already possible with a bit of tweaking.
Soulseek - best p2p network going.
Easy remote mapping of shared folders - as this is the best way to manage files when not at home.
email / calendar server - if I manage to get Wordpress working fully be nice if I get a domain to also be able to use it for email and calendar syncing and if an app other NASs come with.
‘nano’ text editor. Not like it takes a lot of space and I know it can be cross compiled to work as I have done it.
‘iptables’ and also have the netfilter options required for nat enabled in the kernel - Again I know this works as I have build some custom firmware that has the function, wasn’t exactly hard to do.