Not officially. However, the fan project "Operation: Black Mesa" is remaking Opposing Force in the Black Mesa engine – it’s free but requires Black Mesa .
The game explains details the original only hinted at: Who are the Black Ops? What is the purpose of the Race X aliens (a separate species from the Vortigaunts)? And what happens to Black Mesa after Freeman enters the portal? Half-Life- Opposing Force PC Game Free Download Direct Link