Recently I got a copy of Fujita's original paper [T. Fujita, On Polarized Manifolds Whose Adjoint Bundles Are Not Semipositive] from a friend, and it is surprising that his original conjecture is a little more general than the Fujita's freeness conjecture but less well-known to people. So I feel it might be interesting to post it under this question.

The conjecture is: Let $X$ be a projective smooth variety (or a projective variety with at worst Gorenstein rational singularities) of dimension $n$ and $L$ be an ample line bundle on $X$. Let $t$ be a positive integer such that $K_X+tL$ is nef. Then $m(K_X+tL)$ is base point free for all $m>n+1-t$.

Note that in the paper Fujita showed that $K_X+(n+1)L$ is always nef and hence Fujita's freeness conjecture is a special case of this conjecture when $t=n+1$.

uniformstatement. Another obvious comment: if $L$ is nef and big but not ample, then $L^k \otimes K_X$ may be negative on some curve for all $k$. $\endgroup$