Playing with bots
Sometimes playing with bots (computer controlled players) is a fun twist.
For playing against monsters see Coop or Bloodfest instead. For race, see Race
Bots for Quake/QuakeWorld exist since the beginning. Frikbots, Omnicrom bots, bots for CTF, ..... Today, the most common bots are Frogbots. These are integrated in the latest versions of the server modification KTX. This means you can connect to the server and and spawn some bots to start playing!
KTX bots
Connect to a modern KTX server (some servers don't have bots enabled, find one that does). Once you connect, use the console to type commands:
/botcmd enable- enables bot mode - map will restart/botcmd addbot- adds a bot to the match/botcmd addbot 5- adds a bot with skill 5 to the match
Skill can be [0-20], default is 10.
Here is a video explaining the process.
currently there are plenty of maps that you can play with bots: dm6, bravado, dm4, povdmm4...
offline bots
You can also play with bots offline by running your own mvdsv + ktx server and run your own KTX server with bots.
There's an alternative way, in which you download the bot modification, extract to your Quake folder, and run the bots offline, in your own computer.
For more, read the blog entry of KTX supporting Frogbots: https://www.quakeworld.nu/blog/396
There are others, like Omicron bots and recently Humanoid.
lgc
LGC (Lightning Gun Competition) was a worldwide offline competition vs bots. Rules were simple, determine which human player had the best lg vs bots. You can read more about it here: LGC.