Viber alternatives

Apps that do a similar job to Viber, with a short note on how each one differs. None of them is better for everyone; it depends on what you need.

1. 

   IMO

   Singularity IM / imo · Free · ★ 4.3 (9.8M)

   Provides similar tools in this category with an alternative interface and option layout.

2. 

   IMO HD

   Singularity IM / imo · Free · ★ 4.8 (83.1k)

   Provides similar tools in this category with an alternative interface and option layout.