MYSOLR
http://mysolr.readthedocs.org/en/latest/
Actively developed
Besto choice
Python 3

TXSOLR
https://launchpad.net/txsolr
Old and not maintained anymore

PYSOLR, Python Solr
https://bitbucket.org/cogtree/python-solr/overview/
Python Solr is the new version of PySolr
Old and not maintained anymore

SOLRPY
https://pypi.python.org/pypi/solrpy/
It's ok but slower than mysolr
Maybe no Python 3

INSOL
https://github.com/mdomans/insol
Not mature nor actively developed
No Python 3

SUNBURNT
http://github.com/tow/sunburnt
Nothing special
No Python 3

HAYSTACK
http://haystacksearch.org/
When you want to integrate your Django models with Solr

Add docs about Solr clients
Add docs about Solr clients
