Apache2::Resource (3pm) - Limit resources used by httpd children
Apache2::SizeLimit (3pm) - Because size does matter.
BSD::Resource (3pm)  - BSD process resource limit and priority functions
faillog (8)          - display faillog records or set login failure limits
getdelim (3)         - delimited string input
getline (3)          - delimited string input
getrlimit (2)        - get/set resource limits
getrlimit (3p)       - control maximum resource consumption
ldns_buffer_limit (3) - (unknown subject)
ldns_buffer_set_limit (3) - (unknown subject)
limits.conf (5)      - configuration file for the pam_limits module
limits.h (0p)        - implementation-defined constants
listen (3p)          - listen for socket connections and limit the queue of i...
pam_limits (8)       - PAM module to limit resources
pam_securetty (8)    - Limit root login to special devices
quota (1)            - display disk usage and limits
sched_get_priority_max (3p) - get priority limits (REALTIME)
sched_get_priority_min (3p) - get priority limits (REALTIME)
sched_rr_get_interval (3p) - get execution time limits (REALTIME)
setrlimit (2)        - get/set resource limits
setrlimit (3p)       - control maximum resource consumption
tc-bfifo (8)         - Packet limited First In, First Out queue
tc-pfifo (8)         - Packet limited First In, First Out queue
Text::Balanced (3pm) - Extract delimited text sequences from strings.
timeout (1)          - run a command with a time limit
ugetrlimit (2)       - get/set resource limits
ulimit (1)           - bash built-in commands, see bash(1)
ulimit (1p)          - set or report file size limit
security (2)         - unimplemented system calls
ulimit (3)           - get and set user limits
ulimit (3p)          - get and set process limits
ulimit.h (0p)        - ulimit commands