There was a "solo" version that was used on testnet, but it actually makes no sense if not for testing. The system works by selecting one of the voting addresses from one of the participants, and this person will be responsible for issuing vote. In a "solo" version, the person who is selected to vote will have to keep its wallet open 24/7. So everyone participating in the split needs to trust everyone else. But the advantage of this ticket splitting is exactly that you don't need to trust anyone, since the pool handles the voting. If trust is required, it might be better to have a single wallet where every one deposits it's share and the wallet does the buying of tickets and voting.

So, for the software itself, there will probably be no "solo" versions. But the algorithm works for solo mining, so there is nothing holding anyone from forking the code and modifying it to work solo. I just don't see a reason to do so.