Hi,
Here are some of the best free music distribution companies you might like -
1- Amuse - Its free to use the sites distribution system to get music into all major online stores and streaming platforms all over the world. But you have to split 50/50 and it might sound harsh but that's  how this company works.
2. Soundrop - It has created  a system for licensing cover songs which makes it easy for artist to record and release their take on any track. It keeps 15% of streaming revenue.
3. Indiefy review - with its aggregator service you can you can publish your music on streaming portals without upfront costs. It also keeps 15 % of your streaming revenue.
Other good ones are bandcamp, fresh tunes , Awal, etc ..
Hope it helps....