| base64 | Procedures to encode and decode base64 |
| uuencode | encode/decode a binary file |
| cmdline | Procedures to process command lines and options. |
| comm | A remote communications facility for Tcl (7.6, 8.0, and later) |
| control | Procedures for control flow structures. |
| counter | Procedures for counters and histograms. |
| cksum | calculate a cksum(1) compatible checksum |
| crc32 | Perform a 32bit Cyclic Redundancy Check |
| sum | calculate a sum(1) compatible checksum |
| csv | Procedures to handle CSV data |
| fileutil | Procedures implementing some file utilities |
| ftpd | Tcl FTP server implementation |
| ftp | Client-side tcl implementation of the ftp protocol |
| html | Procedures to generate HTML structures. |
| htmlparse | Procedures to parse HTML string |
| irc | Create IRC connection and interface. |
| javascript | Procedures to generate HTML and Java Script structures. |
| log | Procedures to log messages of libraries and applications. |
| combinatorics | |
| math | Tcl math library |
| md5 | Perform md5 hashing |
| mime | Manipulation of MIME body parts |
| smtp | Client-side tcl implementation of the smtp protocol |
| ncgi | Procedures to manipulate CGI values. |
| nntp | Tcl client for the NNTP protocol |
| pop3 | Tcl client for POP3 email protocol |
| profiler | Tcl source code profiler |
| report | Create and manipulate report objects |
| sha1 | Perform sha1 hashing |
| smtpd | Tcl SMTP server implementation |
| stats | Procedures for counters, histograms, and statistics. |
| stooop | Object oriented extension. |
| graph | Create and manipulate directed graph objects |
| matrix | Create and manipulate matrix objects |
| queue | Create and manipulate queue objects |
| stack | Create and manipulate stack objects |
| tree | Create and manipulate tree objects |
| expander | Procedures to process templates and expand text.
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| textutil | Procedures to manipulate texts and strings.. |
| uri | URI utilities |