Add SQLAlchemy and repoze.sendmail to integration documents

docs/integrations.rst

@@ -6,5 +6,18 @@ package so that their transactions can be integerated with others.
 
 `ZODB <http://www.zodb.org>`_
   ZODB was the original user of the ``transaction`` package.  Its
-  transactions are controlled by by ``transaction`` and ZODB fullt
+  transactions are controlled by by ``transaction`` and ZODB fully
   implements the 2-phase commit protocol.
+
+`SQLAlchemy <http://www.sqlalchemy.org>`_
+  An Object Relational Mapper for Python, SQLAlchemy can use
+  `zope.sqlalchemy
+  <https://github.com/zopefoundation/zope.sqlalchemy`_ to have its
+  transactions integrated with others.
+
+`repoze.sendmail <http://docs.repoze.org/sendmail/narr.html`_
+  repoze.sendmail allows coupling the sending of email messages with a
+  transaction,  using the Zope transaction manager. This allows
+  messages to only be sent out when and if a transaction is committed,
+  preventing users from receiving notifications about events which may
+  not have completed successfully.