As we reach the mid point of 2015 I have been working with these extensions on joomla agency projects
ReDJ to do redirect managment
I looked at their Meta tag manager but as I use Flexicontent this doesn't work.
I have been doing a fair amount of API work, mostly just pulling out via Sim PHP but selfget have jBackend witch looks a nice solution and cheap if you need full rest api.
Latest snapshot of Flexicontent is getting better too and fits more the bootstrap feel. I have not tried reworking the extra features yet.
FlexiAdmin, is nice to add custom buttons to the admin homepage, so each article type can have one and save a click.
Do you have a project you need to start on?
Send me your suggestion, I always like to hear from people.