What is the name of these simple filter algorithms?
out[i] = out[i-1] + (alpha*(in[i] - out[i-1]));


From Wikipedia's article on Low pass filters:


  That is, this discrete-time implementation of a simple RC low-pass filter is the exponentially weighted moving average
  
  […]
  
  The loop that calculates each of the n outputs can be refactored into the equivalent:

for i from 1 to n
     y[i] := y[i-1] + α * (x[i] - y[i-1])



So, yes, this is a "exponentially weighted moving average". You can call it that, a single-pole IIR low pass with a decay of $\alpha$, or just a single-tap recursive low pass.

I'm happy I could help you with this, it wasn't very hard!