Alred Camera

• Website link: https://alfred.camera/ 
•  Key features: turns a smartphone into a web-based video surveillance camera. It offers 24/7 live streaming, low light filter, motion detection, siren, two-way talking, and trust circle feature.
• Pricing: this is a paid subcription app: $3.99/month.
• Download links: Google play, and App Store 

Cawise

• Website link: http://cawice.com/ 
•  Key features: turns Android smartphone into a wireless home security camera. It offers live streaming, motion detection, siren alarm, fullscreen mode, sound detection, multi-user mode, HD video, instant alerts, multi-camera mode, two-way talking, video recording, peer-to-peer SSL encryption.
• Pricing: free 
• Download link: Google play  

Salient Eye

• Website link: https://www.salient-eye.com 
• Key features: this app turns a smartphone into a portable home security alarm system. Main features include push notifications on motion detection, remote arming and disarming other related devices, taking live pictures, and browsing user motion event pages and pictures.
• Pricing: free on Android and $1.99 for iOS devices (iPhone and iPad).
• Download links: Google play, and App Store 

Presence

• Website link: http://www.presencepro.com
•  Key features: turns a smartphone into a home security camera system. The app enables users to monitor with live streaming, and on-demand video recording, receive alerts, and ability to share footage.
• Pricing: free on Android, for iOS devices: Pro Video Subscription -$4.99-$49.99 and Pro Video 7-day Pass -$1.99 
• Download links: Google play, and App Store 

EyesPie

• Website link: https://kaarss.webcam 
•  Key features: its official website states that the app turns any old smartphone Into A 24×7 CCTV monitoring Camera that is secure, unhackable, with HD video, battery optimized, provides motion detection, and Wi-Fi support.
• Pricing: Free with in-app purchases
• Download links: Google play