The phrase "a host of programs" is correct and usable in written English.
It can be used to describe a large number or variety of programs available for a specific purpose or within a certain context.
Example: "The conference will feature a host of programs aimed at improving digital literacy among participants."
Alternatives: "a multitude of programs" or "a variety of programs".
At Telluride in Colorado there are a host of programs like ice climbing on frozen waterfalls, including a half-day class for beginners.
And those funds cover a host of programs besides wind and solar, such as building efficiency, biomass, ethanol, fuel cells and basic research.
In the last year, Oakland schools have introduced and expanded a host of programs, some federally subsidized, to feed students at school and home.
And the Treasury Department, the Fed, and the FDIC have introduced a host of programs designed to keep credit flowing, revive the moribund securitized debt market, and stabilize the banking system.
With a mission of keeping families together, it offers a host of programs, including child care, after-school activities, job placement, family counseling, parent groups, a food bank, a sports league and a thrift shop.
Arco Iris stresses that its focus is not to make money, but to finance a host of programs, from teaching children about conflict resolution to training human rights workers to running a crop substitution program for coca farmers.
Just Google "typing programs" and you'll come up with a host of helpful programs.
A host of state programs are also designed to channel students into specific fields.
She has also been a host of PBS programs, including "The Three Tenors in Paris".
And a host of educational programs and Internet sites have sprung up to inform women about their role in history.
The fact that a Republican Congress looted the government on behalf of big business and itself does not discredit Social Security, Medicare and a host of other programs.
