Apache2::Filter (3pm) - Perl API for Apache 2.0 Filtering
Apache2::FilterRec (3pm) - Perl API for manipulating the Apache filter record
bcomps (1)           - biconnected components filter for graphs
bzless (1)           - file perusal filter for crt viewing of bzip2 compresse...
bzmore (1)           - file perusal filter for crt viewing of bzip2 compresse...
c++filt (1)          - Demangle C++ and Java symbols.
ccomps (1)           - connected components filter for graphs
circo (1)            - filter for circular layout of graphs
col (1)              - filter reverse line feeds from input
colcrt (1)           - filter nroff output for CRT previewing
cupsfilter (8)       - convert a file to another format using cups filters
dbilogstrip (1)      - filter to normalize DBI trace logs for diff'ing
DBM_Filter (3pm)     - - Filter DBM keys/values
DBM_Filter::compress (3pm) - filter for DBM_Filter
DBM_Filter::encode (3pm) - filter for DBM_Filter
DBM_Filter::int32 (3pm) - filter for DBM_Filter
DBM_Filter::null (3pm) - filter for DBM_Filter
DBM_Filter::utf8 (3pm) - filter for DBM_Filter
dijkstra (1)         - single-source distance filter
dot (1)              - filter for drawing directed graphs
fdp (1)              - filter for drawing undirected graphs
filter (7)           - cups file conversion filter interface
Filter::Simple (3pm) - Simplified source filtering
Filter::Util::Call (3pm) - Perl Source Filter Utility Module
filterdiff (1)       - extract or exclude diffs from a diff file
fold (1p)            - filter for folding lines
foomatic-rip (1)     - Universal print filter/RIP wrapper
funzip (1)           - filter for extracting from a ZIP archive in a pipe
git-filter-branch (1) - Rewrite branches
git-stripspace (1)   - Filter out empty lines
HTML::Filter (3pm)   - Filter HTML text through the parser
ip6tables (8)        - IPv6 packet filter administration
iptables (8)         - administration tool for IPv4 packet filtering and NAT
Mail::Filter (3pm)   - Filter mail through multiple subroutines
milter-regex (8)     - sendmail milter plugin for regular expression filtering
more (1)             - file perusal filter for crt viewing
msgfilter (1)        - edit translations of message catalog
neato (1)            - filter for drawing undirected graphs
nl (1p)              - line numbering filter
osage (1)            - filter for drawing clustered graphs
pam_filter (8)       - PAM filter module
pcap-filter (7)      - packet filter syntax
perldbmfilter (1)    - Perl DBM Filters
perlfilter (1)       - Source Filters
Pod::Parser (3pm)    - base class for creating POD filters and translators
posix_trace_get_filter (3p) - retrieve and set the filter of an initialized t...
posix_trace_set_filter (3p) - retrieve and set the filter of an initialized t...
sed (1)              - stream editor for filtering and transforming text
sfdp (1)             - filter for drawing large undirected graphs
spamassassin (1)     - extensible email filter used to identify spam
spamassassin-run (1) - simple front-end filtering script for SpamAssassin
spamassassin-run (3pm) - simple front-end filtering script for SpamAssassin
svndumpfilter (1)    - Filter a subversion repository 'dumpfile'.
tc-tbf (8)           - Token Bucket Filter
tred (1)             - transitive reduction filter for directed graphs
twopi (1)            - filter for radial layouts of graphs
uniq (1p)            - report or filter out repeated lines in a file
zless (1)            - file perusal filter for crt viewing of compressed text
zmore (1)            - file perusal filter for crt viewing of compressed text