There is Ohm Studio, which is a stripped down cloud focused DAW and collaboration platform. It's enough to get your ideas together. X amount of projects are free, and then there is a membership for advanced stuff. Easy to find collaborators as you can see who all is logged in to ohm, or has an account with similar interests etc. It's no Sonar, but like I said it's great for generating ideas and meeting collaborators 

Someday, there will be software that allows real time collaboration. Like ON LINE jamming that you could obviously record, etc.
 
I too find that working with other muso's is more creative than one can be by themselves.
 
Now a bit OT,  I was reading how early GENESIS would write songs..... literally, they jammed for hours to some type of visual theme and recorded everything. Went back later and then they all listened to all the jams and picked out little pieces that served as building blocks for songs. Developed the blocks into more structured snippets and then sequenced all the blocks into songs, at which time, Peter Gabriel would write lyrics to the finished pieces.  Peter also participated in the jams singing horrible jam melodies with some words and mostly ah  and  oh sounds, which also went through the process of snipping pieces of melody together and fit to the blocks of music.
 
I have heard some of these jam tapes and they sound horrible... think 1960 garage bands with one mic recording all sound at once.  Then when I listen to the finished product done in the studio, and they are all amazing transformations (from jam to finished product).
 
Long story short..... collaboration is what music is about..... said another way, two heads are better than one even if one is me.
 
Oh, can anyone with more knowledge than me speculate when the communication platform to do this could be ready?  Not in my lifetime I am afraid but someday.
 
Jim
 
PS - sorry for the GENESIS story but I found some of the jam names and the final music to be very interesting... like, PHAROAHS floating down the NILE eventually became "Fly on the Windshield" on The Lamb and wanted to share one technique of writing music with collaborating musicians.
 
 

Unfortunately a true remote real time jam is impossible  (at least until we discover faster than light travel).  Even at the speed of light, it still takes the signal some amount of time to get from point A to point B, and that latency introduced into your jam would be untenable  (and each members latency would be different unless the we're equidistant with equal network speed, etc).  
 
A physicist friend of mine was explaining this to me while my dreams crumbled onto the bar ;)

jklebanPS - sorry for the GENESIS story

That's what my Sunday School teacher said 25 years ago... "but seriously..." that was a pretty cool story and a great example of how collaboration can actually work!!
 
 

There used to be a forum (or post) that listed Sonar users by locale.

Jmagerman,
 
If we can live with 5ms of delay with high latency settings (i can at least), who knows how fast they will be able to get data to stream someday in the future????  Just saying.
 
Jim

Interesting Alan Parsons video on remote recording a vocal here.
https://www.youtube.com/watch?v=LRIZDElKETA
It is not exactly ready for prime time.

I used to collaborate with a previous forum member ( sadly passed away) and we never did finish our first project.
But now
just think now. You could email a template file which would give you the layout of Mix. Now with Mix recall we can swap those settings as well

Agree on plugins that you both have. You can exchange preset files very easily and build up a project one track at a time with an MP3 guide of a rough mix

I think with some little experimentation it wouldn't be too hard.

Data transfer shouldn't be an issue these days. Even though I'm retired I still get projects for mixing sent me. I might get as many as 50 or 60 tracks to mix. I usually use OneDrive as MS gives 1TB of data so I never run out. It easily uploads my biggest file/s overnight when I'm not working

Ironically, I originally posted this considering the possibilities of Gobbler, which is no longer a viable option. However, in the past year+ I have also interacted with many musicians from all levels, and meeting folks is easiest through forums (such as the CH mentioned above), or online classes (Coursera courses (for Berklee) I have done often have one "mega thread" where folks of all levels/genres share their soundcloud material).
 
As far as collaboration, stems tend to be the preferred route; but if fortunate to collaborate with others who use Cakewalk products, bundle files have been incredibly painless. There is a certain amount of coordination with plugs that needs to occur if both parties do not have common plugs, but that tends to be superficial if using stems or freezing tracks.

What's a "stem?" Is it different from a single track exported as a .wav file?