as for true caller i got a answer from true caller ( CEO ? I don't remeber but it's written in wiki page of missing apps ) he said they would help any developer creating the app . And if you post on twitter or facebook i don't think they will create them ( meego dead for them and user base isn't that high ) but you could try .

Edit : Developers response :@Nami_Zar (true
caller CEO ) However if there are any
community developers who want to
develop it we will support them
that was in 2012