Wikipedia's List of LGBT Organizations: http://en.wikipedia.org/wiki/List_of_LGBT-related_organizations

The Frameline Film & Video Completion Fund provides grants to emerging and established lesbian, gay, bisexual and transgender filmmakers.  The Fund seeks to provide a much-needed source of funding for LGBT artists constantly struggling to secure funding needed to complete their works.  Grants ranging from $5,000 to $7,500 are available for works that represent and celebrate diverse stories and reflect LGBT life in all its complexity and richness. Submissions are being accepted for documentary, educational, narrative, animated or experimental projects about lesbian, gay, bisexual and transgender people and their communities.  The Fund also seeks to bring new works to under-served audiences; with this in mind, it especially encourages applications by women, people of color and transgender persons. For complete submission guidelines and application visit:
http://www.frameline.org/filmmaker-support/completion-fund.