Unprogrammed Quakers tend to be liberal - noncreedal and inclusive while still recognizing their Christian roots (although most liberal Meetings have Friends in membership who may not identify as Christian). The focus tends to be on following the religion OF Jesus (think of the Greatest Commandment - Love God and Love Others - and living out the Sermon on the Mount / Beatitudes and the meanings behind the parables) rather than the religion ABOUT Jesus (creeds, etc.). Liberal Quakers and UU's often circulate in the same circles.
Unprogrammed worship is worship IN the silence. Participants sit and settle into the silence. If they feel moved by the Spirit to share something, they rise and do so. Generally other folks do not respond (it is not a discussion group) although one sharing may prompt another. Some Meetings for Worship occur entirely in silence. This silent Meeting for Worship and waiting upon the Spirit (also called the Inner or Inward Light) is the equivalent of communion and even baptism in other Christian churches. (Quakers do not practice outward sacraments.)
Many Quaker Meetings welcome children. Some have "First Day School".
(Important note - not all Quakers are inclusive and liberal. Quakerism exists as a spectrum with different organizations focusing on different theological positions from evangelical Christian to more mainline Christian to liberal unprogrammed. The majority of Quakers in the U.S. tend to be programmed and explicitly Christian. If you see "Friends Church" rather than Meeting House then that is often a clue. The vast majority of unprogrammed Meetings in the U.S. are liberal and inclusive and basically all Quakers in the UK are liberal.)
If you'd like to know more, just ask.