User freddejones has made an ESR thread where he introduces his new Android app named Quake Live Timer. This little app enables you to practice item timing and calculating the time between item spawns. It does not show a countdown timer on the smartphone that will show when the next item will be up. What it does do is give you exercises based on item, all you need to do is quickly figure out when the next item will respawn.
Myself is a mediocre dueler (~1100-1200 ELO) that wanted to practice something quake’ish when commuting between work and home but also wanted to contribute something the community. So I made me an spawn item timing practice app. I find it useful to practice MH and armor but also to use it as warmup before going in a duel.
The app can be found on Google Play when you search for “quake live timer”.