Denominations
There may be small continuing groups of Christian Unitarians who look to the works of Spears, Sharpe and earlier. However, in terms of denominations today which could be identified as "biblical unitarian", the two most visible names are the Church of God General Conference (CoGGC), with 5,000 members in the USA, and Christadelphians, with 60,000 members worldwide. Both of these groups share Non-Trinitarian, specifically Socinian, Christology and both have historians who have acknowledged works such as the Racovian Catechism and Biddle's Twofold Catechism as prefiguring and compatible with their beliefs. Christadelphians are perhaps more reserved than CoGGC in association with the name "Unitarian", given that the Unitarian Church still exists in Britain and many of its independent congregations are mostly post-Christian .
There is also a third, much smaller group - Spirit and Truth Fellowship - which separated from Victor Paul Wierwille's The Way International, and which has taken an interest in the works of biblical unitarians in New England in the 19th century.
In Italy, the Biblical Unitarian movement powered by the ideas of Sozzini and others is represented today by the churches associated with the Christian Church in Italy (CCI). This movement in Italy claims a strong Christian and biblical soul. From the analysis of documents that you can find on the official site of the CCI, it is clear that the doctrinal position of this Christian confession of faith is therefore akin to the so-called Biblical Unitarian movement and on the other hand, far from that of Unitarian Universalist Association who, although they have the same origin in 1500 AD, through the centuries have suffered the influence of many non-biblical ideas (cf. Universalism).
Read more about this topic: Biblical Unitarianism