[Squirrel]

Rattid - A live ticker of exterminator activities and demand.
Green Pace - Free plant spirits and eco terrorism warning feed
American Airlines - A discussion and information network of upcoming stars in the corp world.

[BetaCAV]

Rumblr: matching service for individual/group street fights, or spectators of same. Despite rumors, does not host gambling on the outcome, but does often predict outcomes based on ladders/rankings.

[Rift_0f_Bladz]

BoomStik: Hottest and newest styles of foci avaible to runners
Soak-a-Shot: Newest armor and armor mods to hit the streets
HotWheels: Newest, Fastest, Most Stylish cars and bikes on the streets
Riggs: Hottest tips, tricks, mods, and gear for Riggers
Formula: Spells, Spells, Spells, and some magic theory ever so often

[Angelone]

I like Lone Stargazer: for Lone Star response and info.

[The Wyrm Ouroboros]

I put most app prices at 5-10¥ - it was the shadow apps that were usually on the higher end.

As for Tickers themselves ... 

Weather - current, 12, 24, 48, and 5-day.
Traffic issues (accidents, re-routes, slowdowns).
Overall corporate watches:
     Worldwide (AAA and top-end AAs only)
     Regional (whether by continent or zone, such as 'PacRim', AAA and AA)
     Local (A-rated and above, and even notable sub-A-rated corporations)
Current 'values' for various forms of work.
Gang activity.
Security/Police (whether KE, LS, or other) response times for various areas.
Security/Police alerts.
'Looking For Work/Help Wanted' - shadowrunner LFG sort of thing.
Local Rules/Regs update, for the corporate citizen.
CityWatch - want to keep an eye out for news coming from <Insert City Here>?  Boston, Chicago, Denver.
NationWatch - for political/military/yadda stuff from particular nations.  Aztlan is a VERY popular NationWatch app. 

Most of the latter stuff, of course, is per sprawl; move to San Francisco, baby, and you'll need a whole new slew of apps.

[The Wyrm Ouroboros]

A couple others:

DragonDen / WyrmWatch - keeps an eye on dragon activities, especially Great Dragons.
Spook Central - About free spirits in specific, and spirits in general.

Also, if you have/use Chummer5, this might help.

[gyrobot]

StuffedBelly: Loyalty Program for any runners or wageslave who spends everyday grabbing a nuyen sofkaf or whatever munchies at a convini. This universal loyalty rewards program allows you to know how close you are to your next diabetic and heart attacking enabling treat.