A man can serve God as a religious in a variety of ways. Of course, he can be a diocesan priest. Other options are that he can be a monk, a brother, a friar or a priest within a religious order. Here is a list to a few religious communities for men. There are many more. Contact Father Ross Parker for more information.
Legionaires of Christ
There are a variety of religious communities for women, each with its own particular charism (mission, values). For instance, there are some whose charism is prayer and monasticism while others focus on education, or healthcare or pastoral outreach. The following is a list of links for some religious communities of women.
Congregation of the Humility of Mary
Dominican Sisters of St. Cecilia
Dominican Sisters of Mary, Mother of the Eucharist
School Sisters of St. Francis
Sisters of Charity of the Blessed Virgin Mary (BVM)
Sisters of Mercy
Sisters of St. Benedict
Sisters of St. Francis of the Martyr St. George