Intercom, Olark, GoSquared, Kayako, etc. Which is the best? Go!

check out, slaask or chatlio if you like using slack

i think drift offers a free plan now too if you're strapped on cash.

We're using Drift's free plan at #nowelizator (in combination with their iOS and Android apps for push notifications on the go) and it works like a charm đź‘Ś