diff --git a/kotlin-extensions/src/main/java/ru/touchin/extensions/View.kt b/kotlin-extensions/src/main/java/ru/touchin/extensions/View.kt
index d6e2920..5602cef 100644
--- a/kotlin-extensions/src/main/java/ru/touchin/extensions/View.kt
+++ b/kotlin-extensions/src/main/java/ru/touchin/extensions/View.kt
@@ -2,8 +2,9 @@ package ru.touchin.extensions
 
 import android.os.Build
 import android.view.View
+import ru.touchin.utils.ActionThrottler
 
-private const val RIPPLE_EFFECT_DELAY = 150L
+const val RIPPLE_EFFECT_DELAY_MS = 150L
 
 /**
  * Sets click listener to view. On click it will call something after delay.
@@ -12,7 +13,11 @@ private const val RIPPLE_EFFECT_DELAY = 150L
  */
 fun View.setOnRippleClickListener(listener: () -> Unit) {
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-        setOnClickListener { postDelayed({ if (hasWindowFocus()) listener() }, RIPPLE_EFFECT_DELAY) }
+        setOnClickListener {
+            ActionThrottler.throttleAction {
+                postDelayed({ if (hasWindowFocus()) listener() }, RIPPLE_EFFECT_DELAY_MS)
+            }
+        }
     } else {
         setOnClickListener { listener() }
     }
diff --git a/kotlin-extensions/src/main/java/ru/touchin/utils/ActionThrottler.kt b/kotlin-extensions/src/main/java/ru/touchin/utils/ActionThrottler.kt
new file mode 100644
index 0000000..8721e60
--- /dev/null
+++ b/kotlin-extensions/src/main/java/ru/touchin/utils/ActionThrottler.kt
@@ -0,0 +1,27 @@
+package ru.touchin.utils
+
+import android.os.SystemClock
+import ru.touchin.extensions.RIPPLE_EFFECT_DELAY_MS
+
+object ActionThrottler {
+
+    // It is necessary because in interval after ripple effect finish and before
+    // action invoking start user may be in time to click and launch action again
+    private const val PREVENTION_OF_CLICK_AGAIN_COEFFICIENT = 2
+    private const val DELAY_MS = PREVENTION_OF_CLICK_AGAIN_COEFFICIENT * RIPPLE_EFFECT_DELAY_MS
+    private var lastActionTime = 0L
+
+    fun throttleAction(action: () -> Unit): Boolean {
+        val currentTime = SystemClock.elapsedRealtime()
+        val diff = currentTime - lastActionTime
+
+        return if (diff >= DELAY_MS) {
+            lastActionTime = currentTime
+            action.invoke()
+            true
+        } else {
+            false
+        }
+    }
+
+}
diff --git a/lifecycle/src/main/java/ru/touchin/lifecycle/extensions/ImmutableExt.kt b/lifecycle/src/main/java/ru/touchin/lifecycle/extensions/ImmutableExt.kt
new file mode 100644
index 0000000..a4c1873
--- /dev/null
+++ b/lifecycle/src/main/java/ru/touchin/lifecycle/extensions/ImmutableExt.kt
@@ -0,0 +1,6 @@
+package ru.touchin.lifecycle.extensions
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+
+fun <T> MutableLiveData<T>.toImmutable() = this as LiveData<T>
diff --git a/navigation-base/build.gradle b/navigation-base/build.gradle
index 8d3b8e9..5aa8b2b 100644
--- a/navigation-base/build.gradle
+++ b/navigation-base/build.gradle
@@ -31,9 +31,6 @@ dependencies {
     implementation "androidx.fragment:fragment:$versions.fragment"
     implementation "androidx.fragment:fragment-ktx:$versions.fragment"
 
-    implementation "com.jakewharton:butterknife:$versions.butterknife"
-    kapt "com.jakewharton:butterknife-compiler:$versions.butterknife"
-
     implementation("com.crashlytics.sdk.android:crashlytics:$versions.crashlytics@aar") {
         transitive = true
     }
diff --git a/navigation-base/src/main/java/ru/touchin/roboswag/components/navigation_base/fragments/BaseFragment.kt b/navigation-base/src/main/java/ru/touchin/roboswag/components/navigation_base/fragments/BaseFragment.kt
index e99477a..07c653e 100644
--- a/navigation-base/src/main/java/ru/touchin/roboswag/components/navigation_base/fragments/BaseFragment.kt
+++ b/navigation-base/src/main/java/ru/touchin/roboswag/components/navigation_base/fragments/BaseFragment.kt
@@ -15,9 +15,8 @@ import androidx.annotation.LayoutRes
 import androidx.core.content.ContextCompat
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentActivity
-import butterknife.ButterKnife
-import butterknife.Unbinder
 import ru.touchin.roboswag.components.navigation_base.BuildConfig
+import ru.touchin.roboswag.components.navigation_base.LifecycleLoggingObserver
 
 open class BaseFragment<TActivity : FragmentActivity, TState : Parcelable>(@LayoutRes layoutRes: Int) : Fragment(layoutRes) {
 
@@ -54,8 +53,6 @@ open class BaseFragment<TActivity : FragmentActivity, TState : Parcelable>(@Layo
     protected lateinit var state: TState
         private set
 
-    private lateinit var butterKnifeUnbinder: Unbinder
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
@@ -74,12 +71,6 @@ open class BaseFragment<TActivity : FragmentActivity, TState : Parcelable>(@Layo
         super.onViewCreated(view, savedInstanceState)
 
         lifecycle.addObserver(LifecycleLoggingObserver(this))
-        butterKnifeUnbinder = ButterKnife.bind(this, view)
-    }
-
-    override fun onDestroyView() {
-        butterKnifeUnbinder.unbind()
-        super.onDestroyView()
     }
 
     override fun onSaveInstanceState(outState: Bundle) {
diff --git a/rx-extensions/.gitignore b/rx-extensions/.gitignore
new file mode 100644
index 0000000..796b96d
--- /dev/null
+++ b/rx-extensions/.gitignore
@@ -0,0 +1 @@
+/build
diff --git a/rx-extensions/build.gradle b/rx-extensions/build.gradle
new file mode 100644
index 0000000..3b49d3c
--- /dev/null
+++ b/rx-extensions/build.gradle
@@ -0,0 +1,6 @@
+apply plugin: 'kotlin'
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation "io.reactivex.rxjava2:rxjava:$versions.rxJava"
+}
diff --git a/rx-extensions/src/main/AndroidManifest.xml b/rx-extensions/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..afb773f
--- /dev/null
+++ b/rx-extensions/src/main/AndroidManifest.xml
@@ -0,0 +1,2 @@
+<manifest
+    package="ru.touchin.extensions.rx"/>
diff --git a/rx-extensions/src/main/java/ru/touchin/extensions/rx/Flowable.kt b/rx-extensions/src/main/java/ru/touchin/extensions/rx/Flowable.kt
new file mode 100644
index 0000000..043cf09
--- /dev/null
+++ b/rx-extensions/src/main/java/ru/touchin/extensions/rx/Flowable.kt
@@ -0,0 +1,8 @@
+package ru.touchin.extensions.rx
+
+import io.reactivex.Completable
+import io.reactivex.Flowable
+
+fun <T> Flowable<T>.emitAfter(other: Completable): Flowable<T> = this.flatMap { value ->
+    other.andThen(Flowable.just(value))
+}
diff --git a/rx-extensions/src/main/java/ru/touchin/extensions/rx/Maybe.kt b/rx-extensions/src/main/java/ru/touchin/extensions/rx/Maybe.kt
new file mode 100644
index 0000000..5f5fe6c
--- /dev/null
+++ b/rx-extensions/src/main/java/ru/touchin/extensions/rx/Maybe.kt
@@ -0,0 +1,8 @@
+package ru.touchin.extensions.rx
+
+import io.reactivex.Completable
+import io.reactivex.Maybe
+
+fun <T> Maybe<T>.emitAfter(other: Completable): Maybe<T> = this.flatMap { value ->
+    other.andThen(Maybe.just(value))
+}
diff --git a/rx-extensions/src/main/java/ru/touchin/extensions/rx/Observable.kt b/rx-extensions/src/main/java/ru/touchin/extensions/rx/Observable.kt
new file mode 100644
index 0000000..0c5a8c5
--- /dev/null
+++ b/rx-extensions/src/main/java/ru/touchin/extensions/rx/Observable.kt
@@ -0,0 +1,8 @@
+package ru.touchin.extensions.rx
+
+import io.reactivex.Completable
+import io.reactivex.Observable
+
+fun <T> Observable<T>.emitAfter(other: Completable): Observable<T> = this.flatMap { value ->
+    other.andThen(Observable.just(value))
+}
diff --git a/rx-extensions/src/main/java/ru/touchin/extensions/rx/Single.kt b/rx-extensions/src/main/java/ru/touchin/extensions/rx/Single.kt
new file mode 100644
index 0000000..9c3b6c7
--- /dev/null
+++ b/rx-extensions/src/main/java/ru/touchin/extensions/rx/Single.kt
@@ -0,0 +1,8 @@
+package ru.touchin.extensions.rx
+
+import io.reactivex.Completable
+import io.reactivex.Single
+
+fun <T> Single<T>.emitAfter(other: Completable): Single<T> = this.flatMap { value ->
+    other.andThen(Single.just(value))
+}